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<li class="toctree-l3"><a class="reference internal" href="#example-filter-an-image">Example: Filter an image</a></li>
<li class="toctree-l3"><a class="reference internal" href="#filters">Filters</a></li>
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<span class="target" id="module-PIL.ImageFilter"></span><div class="section" id="imagefilter-module">
<h1><code class="xref py py-mod docutils literal notranslate"><span class="pre">ImageFilter</span></code> Module<a class="headerlink" href="#imagefilter-module" title="Permalink to this headline">¶</a></h1>
<p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">ImageFilter</span></code> module contains definitions for a pre-defined set of
filters, which can be be used with the <a class="reference internal" href="Image.html#PIL.Image.Image.filter" title="PIL.Image.Image.filter"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Image.filter()</span></code></a> method.</p>
<div class="section" id="example-filter-an-image">
<h2>Example: Filter an image<a class="headerlink" href="#example-filter-an-image" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">PIL</span> <span class="kn">import</span> <span class="n">ImageFilter</span>
<span class="n">im1</span> <span class="o">=</span> <span class="n">im</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="n">ImageFilter</span><span class="o">.</span><span class="n">BLUR</span><span class="p">)</span>
<span class="n">im2</span> <span class="o">=</span> <span class="n">im</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="n">ImageFilter</span><span class="o">.</span><span class="n">MinFilter</span><span class="p">(</span><span class="mi">3</span><span class="p">))</span>
<span class="n">im3</span> <span class="o">=</span> <span class="n">im</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="n">ImageFilter</span><span class="o">.</span><span class="n">MinFilter</span><span class="p">)</span> <span class="c1"># same as MinFilter(3)</span>
</pre></div>
</div>
</div>
<div class="section" id="filters">
<h2>Filters<a class="headerlink" href="#filters" title="Permalink to this headline">¶</a></h2>
<p>The current version of the library provides the following set of predefined
image enhancement filters:</p>
<ul class="simple">
<li><strong>BLUR</strong></li>
<li><strong>CONTOUR</strong></li>
<li><strong>DETAIL</strong></li>
<li><strong>EDGE_ENHANCE</strong></li>
<li><strong>EDGE_ENHANCE_MORE</strong></li>
<li><strong>EMBOSS</strong></li>
<li><strong>FIND_EDGES</strong></li>
<li><strong>SHARPEN</strong></li>
<li><strong>SMOOTH</strong></li>
<li><strong>SMOOTH_MORE</strong></li>
</ul>
<dl class="class">
<dt id="PIL.ImageFilter.Color3DLUT">
<em class="property">class </em><code class="descclassname">PIL.ImageFilter.</code><code class="descname">Color3DLUT</code><span class="sig-paren">(</span><em>size</em>, <em>table</em>, <em>channels=3</em>, <em>target_mode=None</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/PIL/ImageFilter.html#Color3DLUT"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#PIL.ImageFilter.Color3DLUT" title="Permalink to this definition">¶</a></dt>
<dd><p>Three-dimensional color lookup table.</p>
<p>Transforms 3-channel pixels using the values of the channels as coordinates
in the 3D lookup table and interpolating the nearest elements.</p>
<p>This method allows you to apply almost any color transformation
in constant time by using pre-calculated decimated tables.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 5.2.0.</span></p>
</div>
<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 last simple">
<li><strong>size</strong> – Size of the table. One int or tuple of (int, int, int).
Minimal size in any dimension is 2, maximum is 65.</li>
<li><strong>table</strong> – Flat lookup table. A list of <code class="docutils literal notranslate"><span class="pre">channels</span> <span class="pre">*</span> <span class="pre">size**3</span></code>
float elements or a list of <code class="docutils literal notranslate"><span class="pre">size**3</span></code> channels-sized
tuples with floats. Channels are changed first,
then first dimension, then second, then third.
Value 0.0 corresponds lowest value of output, 1.0 highest.</li>
<li><strong>channels</strong> – Number of channels in the table. Could be 3 or 4.
Default is 3.</li>
<li><strong>target_mode</strong> – A mode for the result image. Should have not less
than <code class="docutils literal notranslate"><span class="pre">channels</span></code> channels. Default is <code class="docutils literal notranslate"><span class="pre">None</span></code>,
which means that mode wouldn’t be changed.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="PIL.ImageFilter.BoxBlur">
<em class="property">class </em><code class="descclassname">PIL.ImageFilter.</code><code class="descname">BoxBlur</code><span class="sig-paren">(</span><em>radius</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/PIL/ImageFilter.html#BoxBlur"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#PIL.ImageFilter.BoxBlur" title="Permalink to this definition">¶</a></dt>
<dd><p>Blurs the image by setting each pixel to the average value of the pixels
in a square box extending radius pixels in each direction.
Supports float radius of arbitrary size. Uses an optimized implementation
which runs in linear time relative to the size of the image
for any radius value.</p>
<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"><strong>radius</strong> – Size of the box in one direction. Radius 0 does not blur,
returns an identical image. Radius 1 takes 1 pixel
in each direction, i.e. 9 pixels in total.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="PIL.ImageFilter.GaussianBlur">
<em class="property">class </em><code class="descclassname">PIL.ImageFilter.</code><code class="descname">GaussianBlur</code><span class="sig-paren">(</span><em>radius=2</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/PIL/ImageFilter.html#GaussianBlur"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#PIL.ImageFilter.GaussianBlur" title="Permalink to this definition">¶</a></dt>
<dd><p>Gaussian blur filter.</p>
<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"><strong>radius</strong> – Blur radius.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="PIL.ImageFilter.UnsharpMask">
<em class="property">class </em><code class="descclassname">PIL.ImageFilter.</code><code class="descname">UnsharpMask</code><span class="sig-paren">(</span><em>radius=2</em>, <em>percent=150</em>, <em>threshold=3</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/PIL/ImageFilter.html#UnsharpMask"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#PIL.ImageFilter.UnsharpMask" title="Permalink to this definition">¶</a></dt>
<dd><p>Unsharp mask filter.</p>
<p>See Wikipedia’s entry on <a class="reference external" href="https://en.wikipedia.org/wiki/Unsharp_masking#Digital_unsharp_masking">digital unsharp masking</a> for an explanation of
the parameters.</p>
<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 last simple">
<li><strong>radius</strong> – Blur Radius</li>
<li><strong>percent</strong> – Unsharp strength, in percent</li>
<li><strong>threshold</strong> – Threshold controls the minimum brightness change that
will be sharpened</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="PIL.ImageFilter.Kernel">
<em class="property">class </em><code class="descclassname">PIL.ImageFilter.</code><code class="descname">Kernel</code><span class="sig-paren">(</span><em>size</em>, <em>kernel</em>, <em>scale=None</em>, <em>offset=0</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/PIL/ImageFilter.html#Kernel"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#PIL.ImageFilter.Kernel" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a convolution kernel. The current version only
supports 3x3 and 5x5 integer and floating point kernels.</p>
<p>In the current version, kernels can only be applied to
“L” and “RGB” images.</p>
<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 last simple">
<li><strong>size</strong> – Kernel size, given as (width, height). In the current
version, this must be (3,3) or (5,5).</li>
<li><strong>kernel</strong> – A sequence containing kernel weights.</li>
<li><strong>scale</strong> – Scale factor. If given, the result for each pixel is
divided by this value. the default is the sum of the
kernel weights.</li>
<li><strong>offset</strong> – Offset. If given, this value is added to the result,
after it has been divided by the scale factor.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="PIL.ImageFilter.RankFilter">
<em class="property">class </em><code class="descclassname">PIL.ImageFilter.</code><code class="descname">RankFilter</code><span class="sig-paren">(</span><em>size</em>, <em>rank</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/PIL/ImageFilter.html#RankFilter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#PIL.ImageFilter.RankFilter" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a rank filter. The rank filter sorts all pixels in
a window of the given size, and returns the <strong>rank</strong>’th value.</p>
<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 last simple">
<li><strong>size</strong> – The kernel size, in pixels.</li>
<li><strong>rank</strong> – What pixel value to pick. Use 0 for a min filter,
<code class="docutils literal notranslate"><span class="pre">size</span> <span class="pre">*</span> <span class="pre">size</span> <span class="pre">/</span> <span class="pre">2</span></code> for a median filter, <code class="docutils literal notranslate"><span class="pre">size</span> <span class="pre">*</span> <span class="pre">size</span> <span class="pre">-</span> <span class="pre">1</span></code>
for a max filter, etc.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="PIL.ImageFilter.MedianFilter">
<em class="property">class </em><code class="descclassname">PIL.ImageFilter.</code><code class="descname">MedianFilter</code><span class="sig-paren">(</span><em>size=3</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/PIL/ImageFilter.html#MedianFilter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#PIL.ImageFilter.MedianFilter" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a median filter. Picks the median pixel value in a window with the
given size.</p>
<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"><strong>size</strong> – The kernel size, in pixels.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="PIL.ImageFilter.MinFilter">
<em class="property">class </em><code class="descclassname">PIL.ImageFilter.</code><code class="descname">MinFilter</code><span class="sig-paren">(</span><em>size=3</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/PIL/ImageFilter.html#MinFilter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#PIL.ImageFilter.MinFilter" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a min filter. Picks the lowest pixel value in a window with the
given size.</p>
<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"><strong>size</strong> – The kernel size, in pixels.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="PIL.ImageFilter.MaxFilter">
<em class="property">class </em><code class="descclassname">PIL.ImageFilter.</code><code class="descname">MaxFilter</code><span class="sig-paren">(</span><em>size=3</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/PIL/ImageFilter.html#MaxFilter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#PIL.ImageFilter.MaxFilter" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a max filter. Picks the largest pixel value in a window with the
given size.</p>
<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"><strong>size</strong> – The kernel size, in pixels.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="PIL.ImageFilter.ModeFilter">
<em class="property">class </em><code class="descclassname">PIL.ImageFilter.</code><code class="descname">ModeFilter</code><span class="sig-paren">(</span><em>size=3</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/PIL/ImageFilter.html#ModeFilter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#PIL.ImageFilter.ModeFilter" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a mode filter. Picks the most frequent pixel value in a box with the
given size. Pixel values that occur only once or twice are ignored; if no
pixel value occurs more than twice, the original pixel value is preserved.</p>
<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"><strong>size</strong> – The kernel size, in pixels.</td>
</tr>
</tbody>
</table>
</dd></dl>
</div>
</div>
</div>
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