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  • Committer: effbot
  • Date: 2006-03-01 19:31:18 UTC
  • Revision ID: svn-v4:be285980-f00d-0410-a9fe-d4747b46ecd0:pil:24
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Docs/pythondoc-PIL.ImageOps.html
 
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<html><head><title>Module PIL.ImageOps</title><link href="pythondoc.css" rel="stylesheet" title="style" /></head><body><h1>Module PIL.ImageOps</h1><h4>Module Summary:</h4><pre><a href="#70">def autocontrast</a>(image, cutoff=0, ignore=None)</pre><blockquote>Maximize (normalize) image contrast.</blockquote><pre><a href="#145">def colorize</a>(image, black, white)</pre><blockquote>Colorize grayscale image.</blockquote><pre><a href="#167">def crop</a>(image, border=0)</pre><blockquote>Remove border from image.</blockquote><pre><a href="#182">def deform</a>(image, deformer, resample=2)</pre><blockquote>Deform the image.</blockquote><pre><a href="#196">def equalize</a>(image)</pre><blockquote>Equalize the image histogram.</blockquote><pre><a href="#219">def expand</a>(image, border=0, fill=0)</pre><pre><a href="#251">def fit</a>(image, size, method=0, bleed=0.0, centering=(0.5, 0.5))</pre><blockquote>Returns a sized and cropped version of the image, cropped to the
 
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requested aspect ratio and size.</blockquote><pre><a href="#326">def flip</a>(image)</pre><blockquote>Flip the image vertically (top to bottom).</blockquote><pre><a href="#336">def grayscale</a>(image)</pre><blockquote>Convert the image to grayscale.</blockquote><pre><a href="#346">def invert</a>(image)</pre><blockquote>Invert (negate) the image.</blockquote><pre><a href="#359">def mirror</a>(image)</pre><blockquote>Flip image horizontally (left to right).</blockquote><pre><a href="#370">def posterize</a>(image, bits)</pre><blockquote>Reduce the number of bits for each colour channel.</blockquote><pre><a href="#385">def solarize</a>(image, threshold=128)</pre><blockquote>Invert all pixel values above a threshold.</blockquote><h2>Functions</h2><div class="function" id="70"><h3>autocontrast</h3><pre>autocontrast(image, cutoff=0, ignore=None)</pre><p>Maximize (normalize) image contrast.  This function calculates a
 
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histogram of the input image, removes <i>cutoff</i> percent of the
 
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lightest and darkest pixels from the histogram, and remaps the image
 
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so that the darkest pixel becomes black (0), and the lightest
 
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becomes white (255).
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to process.
 
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</p><p><code>cutoff</code> -- How many percent to cut off from the histogram.
 
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</p><p><code>ignore</code> -- The background pixel value (use None for no background).
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="145"><h3>colorize</h3><pre>colorize(image, black, white)</pre><p>Colorize grayscale image.  The <i>black</i> and <i>white</i>
 
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arguments should be RGB tuples; this function calculates a colour
 
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wedge mapping all black pixels in the source image to the first
 
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colour, and all white pixels to the second colour.
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to colourize.
 
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</p><p><code>black</code> -- The colour to use for black input pixels.
 
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</p><p><code>white</code> -- The colour to use for white input pixels.
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="167"><h3>crop</h3><pre>crop(image, border=0)</pre><p>Remove border from image.  The same amount of pixels are removed
 
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from all four sides.  This function works on all image modes.
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to crop.
 
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</p><p><code>border</code> -- The number of pixels to remove.
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="182"><h3>deform</h3><pre>deform(image, deformer, resample=2)</pre><p>Deform the image.
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to deform.
 
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</p><p><code>deformer</code> -- A deformer object.
 
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</p><p><code>resample</code> -- What resampling filter to use.
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="196"><h3>equalize</h3><pre>equalize(image)</pre><p>Equalize the image histogram.  This function applies a non-linear
 
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mapping to the input image, in order to create a uniform
 
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distribution of grayscale values in the output image.
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to equalize.
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="219"><h3>expand</h3><pre>expand(image, border=0, fill=0)</pre><p>Add border to the image
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to expand.
 
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</p><p><code>border</code> -- Border width, in pixels.
 
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</p><p><code>fill</code> -- Pixel fill value (a colour value).  Default is 0 (black).
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="251"><h3>fit</h3><pre>fit(image, size, method=0, bleed=0.0, centering=(0.5, 0.5))</pre><p>Returns a sized and cropped version of the image, cropped to the
 
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requested aspect ratio and size.
 
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</p><p>
 
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The <b>fit</b> function was contributed by Kevin Cazabon.
 
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</p><h4>Parameters:</h4><p><code>size</code> -- The requested output size in pixels, given as a
 
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    (width, height) tuple.
 
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</p><p><code>method</code> -- What resampling method to use.  Default is Image.NEAREST.
 
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</p><p><code>bleed</code> -- Remove a border around the outside of the image (from all
 
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    four edges.  The value is a decimal percentage (use 0.01 for one
 
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    percent).  The default value is 0 (no border).
 
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</p><p><code>centering</code> -- Control the cropping position.  Use (0.5, 0.5) for
 
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    center cropping (e.g. if cropping the width, take 50% off of the
 
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    left side, and therefore 50% off the right side).  (0.0, 0.0)
 
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    will crop from the top left corner (i.e. if cropping the width,
 
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    take all of the crop off of the right side, and if cropping the
 
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    height, take all of it off the bottom).  (1.0, 0.0) will crop
 
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    from the bottom left corner, etc. (i.e. if cropping the width,
 
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    take all of the crop off the left side, and if cropping the height
 
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    take none from the top, and therefore all off the bottom).
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="326"><h3>flip</h3><pre>flip(image)</pre><p>Flip the image vertically (top to bottom).
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to flip.
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="336"><h3>grayscale</h3><pre>grayscale(image)</pre><p>Convert the image to grayscale.
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to convert.
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="346"><h3>invert</h3><pre>invert(image)</pre><p>Invert (negate) the image.
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to invert.
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="359"><h3>mirror</h3><pre>mirror(image)</pre><p>Flip image horizontally (left to right).
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to mirror.
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="370"><h3>posterize</h3><pre>posterize(image, bits)</pre><p>Reduce the number of bits for each colour channel.
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to posterize.
 
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</p><p><code>bits</code> -- The number of bits to keep for each channel (1-8).
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div><div class="function" id="385"><h3>solarize</h3><pre>solarize(image, threshold=128)</pre><p>Invert all pixel values above a threshold.
 
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</p><h4>Parameters:</h4><p><code>image</code> -- The image to posterize.
 
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</p><p><code>threshold</code> -- All pixels above this greyscale level are inverted.
 
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</p><h4>Returns:</h4><p>An image.
 
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</p></div></body></html>
 
 
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