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283 lines
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283 lines
7.7 KiB
HTML
<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'>
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<html>
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<head>
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<meta http-equiv='Content-Type' content='text/html; charset=us-ascii' />
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<title>The PIL.ImageChops Module</title>
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<link rel='stylesheet' href='effbot.css' type='text/css' />
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</head>
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<body>
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<h1>The PIL.ImageChops Module</h1>
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<p>The <b>ImageChops</b> module contains a number of arithmetical image
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operations, called <i>channel operations</i> ("chops"). These can be
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used for various purposes, including special effects, image
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compositions, algorithmic painting, and more.
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</p><p>
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At this time, channel operations are only implemented for 8-bit
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images (e.g. "L" and "RGB").
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</p><p>
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Most channel operations take one or two image arguments and returns
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a new image. Unless otherwise noted, the result of a channel
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operation is always clipped to the range 0 to MAX (which is 255 for
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all modes supported by the operations in this module).
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</p><h2>Module Contents</h2>
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<dl>
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<dt><a id='PIL.ImageChops.add-function' name='PIL.ImageChops.add-function'><b>add(image1, image2, scale=1.0, offset=0)</b></a> [<a href='#PIL.ImageChops.add-function'>#</a>]</dt>
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<dd>
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<p>Add images
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((image1 + image2) / scale + offset).
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</p><p>
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Adds two images, dividing the result by scale and adding the
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offset. If omitted, scale defaults to 1.0, and offset to 0.0.
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</p><dl>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.add_modulo-function' name='PIL.ImageChops.add_modulo-function'><b>add_modulo(image1, image2)</b></a> [<a href='#PIL.ImageChops.add_modulo-function'>#</a>]</dt>
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<dd>
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<p>Add images without clipping
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((image1 + image2) % MAX).
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</p><p>
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Adds two images, without clipping the result.
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</p><dl>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.blend-function' name='PIL.ImageChops.blend-function'><b>blend(image1, image2, alpha)</b></a> [<a href='#PIL.ImageChops.blend-function'>#</a>]</dt>
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<dd>
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<p>Blend images using constant transparency weight.
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</p><p>
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Same as the <b>blend</b> function in the <b>Image</b> module.
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</p></dd>
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<dt><a id='PIL.ImageChops.composite-function' name='PIL.ImageChops.composite-function'><b>composite(image1, image2, mask)</b></a> [<a href='#PIL.ImageChops.composite-function'>#</a>]</dt>
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<dd>
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<p>Create composite using transparency mask.
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</p><p>
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Same as the <b>composite</b> function in the <b>Image</b> module.
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</p></dd>
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<dt><a id='PIL.ImageChops.constant-function' name='PIL.ImageChops.constant-function'><b>constant(image, value)</b></a> [<a href='#PIL.ImageChops.constant-function'>#</a>]</dt>
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<dd>
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<dl>
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<dt><i>image</i></dt>
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<dd>
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</dd>
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<dt><i>value</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.darker-function' name='PIL.ImageChops.darker-function'><b>darker(image1, image2)</b></a> [<a href='#PIL.ImageChops.darker-function'>#</a>]</dt>
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<dd>
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<p>Compare images, and return darker pixel value
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(min(image1, image2)).
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</p><p>
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Compares the two images, pixel by pixel, and returns a new image
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containing the darker values.
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</p><dl>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.difference-function' name='PIL.ImageChops.difference-function'><b>difference(image1, image2)</b></a> [<a href='#PIL.ImageChops.difference-function'>#</a>]</dt>
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<dd>
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<p>Calculate absolute difference
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(abs(image1 - image2)).
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</p><p>
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Returns the absolute value of the difference between the two images.
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</p><dl>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.duplicate-function' name='PIL.ImageChops.duplicate-function'><b>duplicate(image)</b></a> [<a href='#PIL.ImageChops.duplicate-function'>#</a>]</dt>
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<dd>
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<dl>
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<dt><i>image</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.invert-function' name='PIL.ImageChops.invert-function'><b>invert(image)</b></a> [<a href='#PIL.ImageChops.invert-function'>#</a>]</dt>
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<dd>
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<dl>
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<dt><i>image</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.lighter-function' name='PIL.ImageChops.lighter-function'><b>lighter(image1, image2)</b></a> [<a href='#PIL.ImageChops.lighter-function'>#</a>]</dt>
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<dd>
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<p>Compare images, and return lighter pixel value
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(max(image1, image2)).
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</p><p>
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Compares the two images, pixel by pixel, and returns a new image
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containing the lighter values.
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</p><dl>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.logical_and-function' name='PIL.ImageChops.logical_and-function'><b>logical_and(image1, image2)</b></a> [<a href='#PIL.ImageChops.logical_and-function'>#</a>]</dt>
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<dd>
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</dd>
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<dt><a id='PIL.ImageChops.logical_or-function' name='PIL.ImageChops.logical_or-function'><b>logical_or(image1, image2)</b></a> [<a href='#PIL.ImageChops.logical_or-function'>#</a>]</dt>
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<dd>
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</dd>
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<dt><a id='PIL.ImageChops.logical_xor-function' name='PIL.ImageChops.logical_xor-function'><b>logical_xor(image1, image2)</b></a> [<a href='#PIL.ImageChops.logical_xor-function'>#</a>]</dt>
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<dd>
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</dd>
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<dt><a id='PIL.ImageChops.multiply-function' name='PIL.ImageChops.multiply-function'><b>multiply(image1, image2)</b></a> [<a href='#PIL.ImageChops.multiply-function'>#</a>]</dt>
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<dd>
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<p>Superimpose positive images
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(image1 * image2 / MAX).
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</p><p>
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Superimposes two images on top of each other. If you multiply an
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image with a solid black image, the result is black. If you multiply
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with a solid white image, the image is unaffected.
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</p><dl>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.offset-function' name='PIL.ImageChops.offset-function'><b>offset(image, xoffset, yoffset=None)</b></a> [<a href='#PIL.ImageChops.offset-function'>#</a>]</dt>
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<dd>
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<p>Offset image data.
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</p><p>
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Returns a copy of the image where data has been offset by the given
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distances. Data wraps around the edges. If yoffset is omitted, it
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is assumed to be equal to xoffset.
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</p><dl>
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<dt><i>image</i></dt>
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<dd>
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</dd>
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<dt><i>xoffset</i></dt>
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<dd>
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</dd>
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<dt><i>yoffset</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.screen-function' name='PIL.ImageChops.screen-function'><b>screen(image1, image2)</b></a> [<a href='#PIL.ImageChops.screen-function'>#</a>]</dt>
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<dd>
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<p>Superimpose negative images
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(MAX - ((MAX - image1) * (MAX - image2) / MAX)).
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</p><p>
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Superimposes two inverted images on top of each other.
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</p><dl>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.subtract-function' name='PIL.ImageChops.subtract-function'><b>subtract(image1, image2, scale=1.0, offset=0)</b></a> [<a href='#PIL.ImageChops.subtract-function'>#</a>]</dt>
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<dd>
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<p>Subtract images
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((image1 - image2) / scale + offset).
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</p><p>
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Subtracts two images, dividing the result by scale and adding the
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offset. If omitted, scale defaults to 1.0, and offset to 0.0.
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</p><dl>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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<dt><a id='PIL.ImageChops.subtract_modulo-function' name='PIL.ImageChops.subtract_modulo-function'><b>subtract_modulo(image1, image2)</b></a> [<a href='#PIL.ImageChops.subtract_modulo-function'>#</a>]</dt>
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<dd>
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<p>Subtract images without clipping
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((image1 - image2) % MAX).
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</p><p>
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Subtracts two images, without clipping the result.
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</p><dl>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt><i>image1</i></dt>
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<dd>
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</dd>
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<dt>Returns:</dt>
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<dd>
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</dd>
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</dl><br />
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</dd>
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</dl>
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</body></html>
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