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- <div class="section" id="image-manipulation-class">
-<h1>Image Manipulation Class<a class="headerlink" href="#image-manipulation-class" title="Permalink to this headline">¶</a></h1>
-<p>CodeIgniter’s Image Manipulation class lets you perform the following
-actions:</p>
-<ul class="simple">
-<li>Image Resizing</li>
-<li>Thumbnail Creation</li>
-<li>Image Cropping</li>
-<li>Image Rotating</li>
-<li>Image Watermarking</li>
-</ul>
-<p>All three major image libraries are supported: GD/GD2, NetPBM, and
-ImageMagick</p>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p class="last">Watermarking is only available using the GD/GD2 library. In
-addition, even though other libraries are supported, GD is required in
-order for the script to calculate the image properties. The image
-processing, however, will be performed with the library you specify.</p>
-</div>
-<div class="contents local topic" id="contents">
-<ul class="simple">
-<li><a class="reference internal" href="#initializing-the-class" id="id1">Initializing the Class</a><ul>
-<li><a class="reference internal" href="#processing-an-image" id="id2">Processing an Image</a></li>
-<li><a class="reference internal" href="#processing-methods" id="id3">Processing Methods</a></li>
-<li><a class="reference internal" href="#preferences" id="id4">Preferences</a></li>
-<li><a class="reference internal" href="#setting-preferences-in-a-config-file" id="id5">Setting preferences in a config file</a></li>
-</ul>
-</li>
-<li><a class="reference internal" href="#image-watermarking" id="id6">Image Watermarking</a><ul>
-<li><a class="reference internal" href="#two-types-of-watermarking" id="id7">Two Types of Watermarking</a></li>
-<li><a class="reference internal" href="#watermarking-an-image" id="id8">Watermarking an Image</a></li>
-<li><a class="reference internal" href="#watermarking-preferences" id="id9">Watermarking Preferences</a><ul>
-<li><a class="reference internal" href="#text-preferences" id="id10">Text Preferences</a></li>
-<li><a class="reference internal" href="#overlay-preferences" id="id11">Overlay Preferences</a></li>
-</ul>
-</li>
-</ul>
-</li>
-<li><a class="reference internal" href="#class-reference" id="id12">Class Reference</a></li>
-</ul>
-</div>
-<div class="custom-index container"></div><div class="section" id="initializing-the-class">
-<h2><a class="toc-backref" href="#id1">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h2>
-<p>Like most other classes in CodeIgniter, the image class is initialized
-in your controller using the $this-&gt;load-&gt;library function:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;image_lib&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>Once the library is loaded it will be ready for use. The image library
-object you will use to call all functions is: <code class="docutils literal"><span class="pre">$this-&gt;image_lib</span></code></p>
-<div class="section" id="processing-an-image">
-<h3><a class="toc-backref" href="#id2">Processing an Image</a><a class="headerlink" href="#processing-an-image" title="Permalink to this headline">¶</a></h3>
-<p>Regardless of the type of processing you would like to perform
-(resizing, cropping, rotation, or watermarking), the general process is
-identical. You will set some preferences corresponding to the action you
-intend to perform, then call one of four available processing functions.
-For example, to create an image thumbnail you’ll do this:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;image_library&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;gd2&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;source_image&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/path/to/image/mypic.jpg&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;create_thumb&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;maintain_ratio&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;width&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">75</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;height&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">50</span><span class="p">;</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;image_lib&#39;</span><span class="p">,</span> <span class="nv">$config</span><span class="p">);</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">resize</span><span class="p">();</span>
-</pre></div>
-</div>
-<p>The above code tells the image_resize function to look for an image
-called <em>mypic.jpg</em> located in the source_image folder, then create a
-thumbnail that is 75 X 50 pixels using the GD2 image_library. Since the
-maintain_ratio option is enabled, the thumb will be as close to the
-target width and height as possible while preserving the original aspect
-ratio. The thumbnail will be called <em>mypic_thumb.jpg</em> and located at
-the same level as <em>source_image</em>.</p>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p class="last">In order for the image class to be allowed to do any
-processing, the folder containing the image files must have write
-permissions.</p>
-</div>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p class="last">Image processing can require a considerable amount of server
-memory for some operations. If you are experiencing out of memory errors
-while processing images you may need to limit their maximum size, and/or
-adjust PHP memory limits.</p>
-</div>
-</div>
-<div class="section" id="processing-methods">
-<h3><a class="toc-backref" href="#id3">Processing Methods</a><a class="headerlink" href="#processing-methods" title="Permalink to this headline">¶</a></h3>
-<p>There are four available processing methods:</p>
-<ul class="simple">
-<li>$this-&gt;image_lib-&gt;resize()</li>
-<li>$this-&gt;image_lib-&gt;crop()</li>
-<li>$this-&gt;image_lib-&gt;rotate()</li>
-<li>$this-&gt;image_lib-&gt;watermark()</li>
-</ul>
-<p>These methods return boolean TRUE upon success and FALSE for failure.
-If they fail you can retrieve the error message using this function:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
-</pre></div>
-</div>
-<p>A good practice is to use the processing function conditionally, showing an
-error upon failure, like this:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">resize</span><span class="p">())</span>
-<span class="p">{</span>
- <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
-<span class="p">}</span>
-</pre></div>
-</div>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p>You can optionally specify the HTML formatting to be applied to
-the errors, by submitting the opening/closing tags in the function,
-like this:</p>
-<div class="last highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">(</span><span class="s1">&#39;&lt;p&gt;&#39;</span><span class="p">,</span> <span class="s1">&#39;&lt;/p&gt;&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-</div>
-</div>
-<div class="section" id="preferences">
-<span id="processing-preferences"></span><h3><a class="toc-backref" href="#id4">Preferences</a><a class="headerlink" href="#preferences" title="Permalink to this headline">¶</a></h3>
-<p>The preferences described below allow you to tailor the image processing
-to suit your needs.</p>
-<p>Note that not all preferences are available for every function. For
-example, the x/y axis preferences are only available for image cropping.
-Likewise, the width and height preferences have no effect on cropping.
-The “availability” column indicates which functions support a given
-preference.</p>
-<p>Availability Legend:</p>
-<ul class="simple">
-<li>R - Image Resizing</li>
-<li>C - Image Cropping</li>
-<li>X - Image Rotation</li>
-<li>W - Image Watermarking</li>
-</ul>
-<table border="1" class="docutils">
-<colgroup>
-<col width="14%" />
-<col width="14%" />
-<col width="19%" />
-<col width="45%" />
-<col width="8%" />
-</colgroup>
-<thead valign="bottom">
-<tr class="row-odd"><th class="head">Preference</th>
-<th class="head">Default Value</th>
-<th class="head">Options</th>
-<th class="head">Description</th>
-<th class="head">Availability</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr class="row-even"><td><strong>image_library</strong></td>
-<td>GD2</td>
-<td>GD, GD2, ImageMagick, NetPBM</td>
-<td>Sets the image library to be used.</td>
-<td>R, C, X, W</td>
-</tr>
-<tr class="row-odd"><td><strong>library_path</strong></td>
-<td>None</td>
-<td>None</td>
-<td>Sets the server path to your ImageMagick or NetPBM library. If you use
-either of those libraries you must supply the path.</td>
-<td>R, C, X
-R, C, S, W</td>
-</tr>
-<tr class="row-even"><td><strong>source_image</strong></td>
-<td>None</td>
-<td>None</td>
-<td>Sets the source image name/path. The path must be a relative or absolute
-server path, not a URL.</td>
-<td>&#160;</td>
-</tr>
-<tr class="row-odd"><td><strong>dynamic_output</strong></td>
-<td>FALSE</td>
-<td>TRUE/FALSE (boolean)</td>
-<td>Determines whether the new image file should be written to disk or
-generated dynamically. Note: If you choose the dynamic setting, only one
-image can be shown at a time, and it can’t be positioned on the page. It
-simply outputs the raw image dynamically to your browser, along with
-image headers.</td>
-<td>R, C, X, W</td>
-</tr>
-<tr class="row-even"><td><strong>file_permissions</strong></td>
-<td>0644</td>
-<td>(integer)</td>
-<td>File system permissions to apply on the resulting image file,
-writing it to the disk. WARNING: Use octal integer notation!</td>
-<td>R, C, X, W</td>
-</tr>
-<tr class="row-odd"><td><strong>quality</strong></td>
-<td>90%</td>
-<td>1 - 100%</td>
-<td>Sets the quality of the image. The higher the quality the larger the
-file size.</td>
-<td>R, C, X, W</td>
-</tr>
-<tr class="row-even"><td><strong>new_image</strong></td>
-<td>None</td>
-<td>None</td>
-<td>Sets the destination image name/path. You’ll use this preference when
-creating an image copy. The path must be a relative or absolute server
-path, not a URL.</td>
-<td>R, C, X, W</td>
-</tr>
-<tr class="row-odd"><td><strong>width</strong></td>
-<td>None</td>
-<td>None</td>
-<td>Sets the width you would like the image set to.</td>
-<td>R, C</td>
-</tr>
-<tr class="row-even"><td><strong>height</strong></td>
-<td>None</td>
-<td>None</td>
-<td>Sets the height you would like the image set to.</td>
-<td>R, C</td>
-</tr>
-<tr class="row-odd"><td><strong>create_thumb</strong></td>
-<td>FALSE</td>
-<td>TRUE/FALSE (boolean)</td>
-<td>Tells the image processing function to create a thumb.</td>
-<td>R</td>
-</tr>
-<tr class="row-even"><td><strong>thumb_marker</strong></td>
-<td>_thumb</td>
-<td>None</td>
-<td>Specifies the thumbnail indicator. It will be inserted just before the
-file extension, so mypic.jpg would become mypic_thumb.jpg</td>
-<td>R</td>
-</tr>
-<tr class="row-odd"><td><strong>maintain_ratio</strong></td>
-<td>TRUE</td>
-<td>TRUE/FALSE (boolean)</td>
-<td>Specifies whether to maintain the original aspect ratio when resizing or
-use hard values.</td>
-<td>R, C</td>
-</tr>
-<tr class="row-even"><td><strong>master_dim</strong></td>
-<td>auto</td>
-<td>auto, width, height</td>
-<td>Specifies what to use as the master axis when resizing or creating
-thumbs. For example, let’s say you want to resize an image to 100 X 75
-pixels. If the source image size does not allow perfect resizing to
-those dimensions, this setting determines which axis should be used as
-the hard value. “auto” sets the axis automatically based on whether the
-image is taller than wider, or vice versa.</td>
-<td>R</td>
-</tr>
-<tr class="row-odd"><td><strong>rotation_angle</strong></td>
-<td>None</td>
-<td>90, 180, 270, vrt, hor</td>
-<td>Specifies the angle of rotation when rotating images. Note that PHP
-rotates counter-clockwise, so a 90 degree rotation to the right must be
-specified as 270.</td>
-<td>X</td>
-</tr>
-<tr class="row-even"><td><strong>x_axis</strong></td>
-<td>None</td>
-<td>None</td>
-<td>Sets the X coordinate in pixels for image cropping. For example, a
-setting of 30 will crop an image 30 pixels from the left.</td>
-<td>C</td>
-</tr>
-<tr class="row-odd"><td><strong>y_axis</strong></td>
-<td>None</td>
-<td>None</td>
-<td>Sets the Y coordinate in pixels for image cropping. For example, a
-setting of 30 will crop an image 30 pixels from the top.</td>
-<td>C</td>
-</tr>
-</tbody>
-</table>
-</div>
-<div class="section" id="setting-preferences-in-a-config-file">
-<h3><a class="toc-backref" href="#id5">Setting preferences in a config file</a><a class="headerlink" href="#setting-preferences-in-a-config-file" title="Permalink to this headline">¶</a></h3>
-<p>If you prefer not to set preferences using the above method, you can
-instead put them into a config file. Simply create a new file called
-image_lib.php, add the $config array in that file. Then save the file
-in <em>config/image_lib.php</em> and it will be used automatically. You will
-NOT need to use the <code class="docutils literal"><span class="pre">$this-&gt;image_lib-&gt;initialize()</span></code> method if you save
-your preferences in a config file.</p>
-</div>
-</div>
-<div class="section" id="image-watermarking">
-<h2><a class="toc-backref" href="#id6">Image Watermarking</a><a class="headerlink" href="#image-watermarking" title="Permalink to this headline">¶</a></h2>
-<p>The Watermarking feature requires the GD/GD2 library.</p>
-<div class="section" id="two-types-of-watermarking">
-<h3><a class="toc-backref" href="#id7">Two Types of Watermarking</a><a class="headerlink" href="#two-types-of-watermarking" title="Permalink to this headline">¶</a></h3>
-<p>There are two types of watermarking that you can use:</p>
-<ul class="simple">
-<li><strong>Text</strong>: The watermark message will be generated using text, either
-with a True Type font that you specify, or using the native text
-output that the GD library supports. If you use the True Type version
-your GD installation must be compiled with True Type support (most
-are, but not all).</li>
-<li><strong>Overlay</strong>: The watermark message will be generated by overlaying an
-image (usually a transparent PNG or GIF) containing your watermark
-over the source image.</li>
-</ul>
-</div>
-<div class="section" id="watermarking-an-image">
-<span id="watermarking"></span><h3><a class="toc-backref" href="#id8">Watermarking an Image</a><a class="headerlink" href="#watermarking-an-image" title="Permalink to this headline">¶</a></h3>
-<p>Just as with the other methods (resizing, cropping, and rotating) the
-general process for watermarking involves setting the preferences
-corresponding to the action you intend to perform, then calling the
-watermark function. Here is an example:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;source_image&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/path/to/image/mypic.jpg&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_text&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;Copyright 2006 - John Doe&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_type&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;text&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_font_path&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;./system/fonts/texb.ttf&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_font_size&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;16&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_font_color&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;ffffff&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_vrt_alignment&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;bottom&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_hor_alignment&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;center&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_padding&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;20&#39;</span><span class="p">;</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">watermark</span><span class="p">();</span>
-</pre></div>
-</div>
-<p>The above example will use a 16 pixel True Type font to create the text
-“Copyright 2006 - John Doe”. The watermark will be positioned at the
-bottom/center of the image, 20 pixels from the bottom of the image.</p>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p class="last">In order for the image class to be allowed to do any
-processing, the image file must have “write” file permissions
-For example, 777.</p>
-</div>
-</div>
-<div class="section" id="watermarking-preferences">
-<h3><a class="toc-backref" href="#id9">Watermarking Preferences</a><a class="headerlink" href="#watermarking-preferences" title="Permalink to this headline">¶</a></h3>
-<p>This table shows the preferences that are available for both types of
-watermarking (text or overlay)</p>
-<table border="1" class="docutils">
-<colgroup>
-<col width="17%" />
-<col width="14%" />
-<col width="17%" />
-<col width="53%" />
-</colgroup>
-<thead valign="bottom">
-<tr class="row-odd"><th class="head">Preference</th>
-<th class="head">Default Value</th>
-<th class="head">Options</th>
-<th class="head">Description</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr class="row-even"><td><strong>wm_type</strong></td>
-<td>text</td>
-<td>text, overlay</td>
-<td>Sets the type of watermarking that should be used.</td>
-</tr>
-<tr class="row-odd"><td><strong>source_image</strong></td>
-<td>None</td>
-<td>None</td>
-<td>Sets the source image name/path. The path must be a relative or absolute
-server path, not a URL.</td>
-</tr>
-<tr class="row-even"><td><strong>dynamic_output</strong></td>
-<td>FALSE</td>
-<td>TRUE/FALSE (boolean)</td>
-<td>Determines whether the new image file should be written to disk or
-generated dynamically. Note: If you choose the dynamic setting, only one
-image can be shown at a time, and it can’t be positioned on the page. It
-simply outputs the raw image dynamically to your browser, along with
-image headers.</td>
-</tr>
-<tr class="row-odd"><td><strong>quality</strong></td>
-<td>90%</td>
-<td>1 - 100%</td>
-<td>Sets the quality of the image. The higher the quality the larger the
-file size.</td>
-</tr>
-<tr class="row-even"><td><strong>wm_padding</strong></td>
-<td>None</td>
-<td>A number</td>
-<td>The amount of padding, set in pixels, that will be applied to the
-watermark to set it away from the edge of your images.</td>
-</tr>
-<tr class="row-odd"><td><strong>wm_vrt_alignment</strong></td>
-<td>bottom</td>
-<td>top, middle, bottom</td>
-<td>Sets the vertical alignment for the watermark image.</td>
-</tr>
-<tr class="row-even"><td><strong>wm_hor_alignment</strong></td>
-<td>center</td>
-<td>left, center, right</td>
-<td>Sets the horizontal alignment for the watermark image.</td>
-</tr>
-<tr class="row-odd"><td><strong>wm_hor_offset</strong></td>
-<td>None</td>
-<td>None</td>
-<td>You may specify a horizontal offset (in pixels) to apply to the
-watermark position. The offset normally moves the watermark to the
-right, except if you have your alignment set to “right” then your offset
-value will move the watermark toward the left of the image.</td>
-</tr>
-<tr class="row-even"><td><strong>wm_vrt_offset</strong></td>
-<td>None</td>
-<td>None</td>
-<td>You may specify a vertical offset (in pixels) to apply to the watermark
-position. The offset normally moves the watermark down, except if you
-have your alignment set to “bottom” then your offset value will move the
-watermark toward the top of the image.</td>
-</tr>
-</tbody>
-</table>
-<div class="section" id="text-preferences">
-<h4><a class="toc-backref" href="#id10">Text Preferences</a><a class="headerlink" href="#text-preferences" title="Permalink to this headline">¶</a></h4>
-<p>This table shows the preferences that are available for the text type of
-watermarking.</p>
-<table border="1" class="docutils">
-<colgroup>
-<col width="17%" />
-<col width="14%" />
-<col width="14%" />
-<col width="55%" />
-</colgroup>
-<thead valign="bottom">
-<tr class="row-odd"><th class="head">Preference</th>
-<th class="head">Default Value</th>
-<th class="head">Options</th>
-<th class="head">Description</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr class="row-even"><td><strong>wm_text</strong></td>
-<td>None</td>
-<td>None</td>
-<td>The text you would like shown as the watermark. Typically this will be a
-copyright notice.</td>
-</tr>
-<tr class="row-odd"><td><strong>wm_font_path</strong></td>
-<td>None</td>
-<td>None</td>
-<td>The server path to the True Type Font you would like to use. If you do
-not use this option, the native GD font will be used.</td>
-</tr>
-<tr class="row-even"><td><strong>wm_font_size</strong></td>
-<td>16</td>
-<td>None</td>
-<td>The size of the text. Note: If you are not using the True Type option
-above, the number is set using a range of 1 - 5. Otherwise, you can use
-any valid pixel size for the font you’re using.</td>
-</tr>
-<tr class="row-odd"><td><strong>wm_font_color</strong></td>
-<td>ffffff</td>
-<td>None</td>
-<td>The font color, specified in hex. Both the full 6-length (ie, 993300) and
-the short three character abbreviated version (ie, fff) are supported.</td>
-</tr>
-<tr class="row-even"><td><strong>wm_shadow_color</strong></td>
-<td>None</td>
-<td>None</td>
-<td>The color of the drop shadow, specified in hex. If you leave this blank
-a drop shadow will not be used. Both the full 6-length (ie, 993300) and
-the short three character abbreviated version (ie, fff) are supported.</td>
-</tr>
-<tr class="row-odd"><td><strong>wm_shadow_distance</strong></td>
-<td>3</td>
-<td>None</td>
-<td>The distance (in pixels) from the font that the drop shadow should
-appear.</td>
-</tr>
-</tbody>
-</table>
-</div>
-<div class="section" id="overlay-preferences">
-<h4><a class="toc-backref" href="#id11">Overlay Preferences</a><a class="headerlink" href="#overlay-preferences" title="Permalink to this headline">¶</a></h4>
-<p>This table shows the preferences that are available for the overlay type
-of watermarking.</p>
-<table border="1" class="docutils">
-<colgroup>
-<col width="17%" />
-<col width="14%" />
-<col width="14%" />
-<col width="55%" />
-</colgroup>
-<thead valign="bottom">
-<tr class="row-odd"><th class="head">Preference</th>
-<th class="head">Default Value</th>
-<th class="head">Options</th>
-<th class="head">Description</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr class="row-even"><td><strong>wm_overlay_path</strong></td>
-<td>None</td>
-<td>None</td>
-<td>The server path to the image you wish to use as your watermark. Required
-only if you are using the overlay method.</td>
-</tr>
-<tr class="row-odd"><td><strong>wm_opacity</strong></td>
-<td>50</td>
-<td>1 - 100</td>
-<td>Image opacity. You may specify the opacity (i.e. transparency) of your
-watermark image. This allows the watermark to be faint and not
-completely obscure the details from the original image behind it. A 50%
-opacity is typical.</td>
-</tr>
-<tr class="row-even"><td><strong>wm_x_transp</strong></td>
-<td>4</td>
-<td>A number</td>
-<td>If your watermark image is a PNG or GIF image, you may specify a color
-on the image to be “transparent”. This setting (along with the next)
-will allow you to specify that color. This works by specifying the “X”
-and “Y” coordinate pixel (measured from the upper left) within the image
-that corresponds to a pixel representative of the color you want to be
-transparent.</td>
-</tr>
-<tr class="row-odd"><td><strong>wm_y_transp</strong></td>
-<td>4</td>
-<td>A number</td>
-<td>Along with the previous setting, this allows you to specify the
-coordinate to a pixel representative of the color you want to be
-transparent.</td>
-</tr>
-</tbody>
-</table>
-</div>
-</div>
-</div>
-<div class="section" id="class-reference">
-<h2><a class="toc-backref" href="#id12">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
-<dl class="class">
-<dt id="CI_Image_lib">
-<em class="property">class </em><code class="descname">CI_Image_lib</code><a class="headerlink" href="#CI_Image_lib" title="Permalink to this definition">¶</a></dt>
-<dd><dl class="method">
-<dt id="CI_Image_lib::initialize">
-<code class="descname">initialize</code><span class="sig-paren">(</span><span class="optional">[</span><em>$props = array()</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::initialize" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$props</strong> (<em>array</em>) – Image processing preferences</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE in case of invalid settings</p>
-</td>
-</tr>
-<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Initializes the class for processing an image.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Image_lib::resize">
-<code class="descname">resize</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::resize" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
-</tr>
-</tbody>
-</table>
-<p>The image resizing method lets you resize the original image, create a
-copy (with or without resizing), or create a thumbnail image.</p>
-<p>For practical purposes there is no difference between creating a copy
-and creating a thumbnail except a thumb will have the thumbnail marker
-as part of the name (i.e. mypic_thumb.jpg).</p>
-<p>All preferences listed in the <a class="reference internal" href="#processing-preferences"><span class="std std-ref">Preferences</span></a> table are available for this
-method except these three: <em>rotation_angle</em>, <em>x_axis</em> and <em>y_axis</em>.</p>
-<p><strong>Creating a Thumbnail</strong></p>
-<p>The resizing method will create a thumbnail file (and preserve the
-original) if you set this preference to TRUE:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;create_thumb&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span>
-</pre></div>
-</div>
-<p>This single preference determines whether a thumbnail is created or not.</p>
-<p><strong>Creating a Copy</strong></p>
-<p>The resizing method will create a copy of the image file (and preserve
-the original) if you set a path and/or a new filename using this
-preference:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;new_image&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/path/to/new_image.jpg&#39;</span><span class="p">;</span>
-</pre></div>
-</div>
-<p>Notes regarding this preference:</p>
-<ul class="simple">
-<li>If only the new image name is specified it will be placed in the same
-folder as the original</li>
-<li>If only the path is specified, the new image will be placed in the
-destination with the same name as the original.</li>
-<li>If both the path and image name are specified it will placed in its
-own destination and given the new name.</li>
-</ul>
-<p><strong>Resizing the Original Image</strong></p>
-<p>If neither of the two preferences listed above (create_thumb, and
-new_image) are used, the resizing method will instead target the
-original image for processing.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Image_lib::crop">
-<code class="descname">crop</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::crop" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
-</tr>
-</tbody>
-</table>
-<p>The cropping method works nearly identically to the resizing function
-except it requires that you set preferences for the X and Y axis (in
-pixels) specifying where to crop, like this:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;x_axis&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">100</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;y_axis&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">40</span><span class="p">;</span>
-</pre></div>
-</div>
-<p>All preferences listed in the <a class="reference internal" href="#processing-preferences"><span class="std std-ref">Preferences</span></a> table are available for this
-method except these: <em>rotation_angle</em>, <em>create_thumb</em> and <em>new_image</em>.</p>
-<p>Here’s an example showing how you might crop an image:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;image_library&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;imagemagick&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;library_path&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/usr/X11R6/bin/&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;source_image&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/path/to/image/mypic.jpg&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;x_axis&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">100</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;y_axis&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">60</span><span class="p">;</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
-
-<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">crop</span><span class="p">())</span>
-<span class="p">{</span>
- <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
-<span class="p">}</span>
-</pre></div>
-</div>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p class="last">Without a visual interface it is difficult to crop images, so this
-method is not very useful unless you intend to build such an
-interface. That’s exactly what we did using for the photo gallery module
-in ExpressionEngine, the CMS we develop. We added a JavaScript UI that
-lets the cropping area be selected.</p>
-</div>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Image_lib::rotate">
-<code class="descname">rotate</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::rotate" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
-</tr>
-</tbody>
-</table>
-<p>The image rotation method requires that the angle of rotation be set
-via its preference:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;rotation_angle&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;90&#39;</span><span class="p">;</span>
-</pre></div>
-</div>
-<p>There are 5 rotation options:</p>
-<ol class="arabic simple">
-<li>90 - rotates counter-clockwise by 90 degrees.</li>
-<li>180 - rotates counter-clockwise by 180 degrees.</li>
-<li>270 - rotates counter-clockwise by 270 degrees.</li>
-<li>hor - flips the image horizontally.</li>
-<li>vrt - flips the image vertically.</li>
-</ol>
-<p>Here’s an example showing how you might rotate an image:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;image_library&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;netpbm&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;library_path&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/usr/bin/&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;source_image&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/path/to/image/mypic.jpg&#39;</span><span class="p">;</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;rotation_angle&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;hor&#39;</span><span class="p">;</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
-
-<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">rotate</span><span class="p">())</span>
-<span class="p">{</span>
- <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
-<span class="p">}</span>
-</pre></div>
-</div>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Image_lib::watermark">
-<code class="descname">watermark</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::watermark" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
-</tr>
-</tbody>
-</table>
-<p>Creates a watermark over an image, please refer to the <a class="reference internal" href="#watermarking"><span class="std std-ref">Watermarking an Image</span></a>
-section for more info.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Image_lib::clear">
-<code class="descname">clear</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::clear" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">void</td>
-</tr>
-</tbody>
-</table>
-<p>The clear method resets all of the values used when processing an
-image. You will want to call this if you are processing images in a
-loop.</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">clear</span><span class="p">();</span>
-</pre></div>
-</div>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Image_lib::display_errors">
-<code class="descname">display_errors</code><span class="sig-paren">(</span><span class="optional">[</span><em>$open = '&lt;p&gt;</em><span class="optional">[</span>, <em>$close = '&lt;/p&gt;'</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::display_errors" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$open</strong> (<em>string</em>) – Error message opening tag</li>
-<li><strong>$close</strong> (<em>string</em>) – Error message closing tag</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Error messages</p>
-</td>
-</tr>
-<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Returns all detected errors formatted as a string.</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
-</pre></div>
-</div>
-</dd></dl>
-
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