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82 lines
2.5 KiB
ReStructuredText
82 lines
2.5 KiB
ReStructuredText
.. py:module:: PIL.ImageEnhance
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.. py:currentmodule:: PIL.ImageEnhance
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:py:mod:`~PIL.ImageEnhance` Module
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==================================
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The :py:mod:`~PIL.ImageEnhance` module contains a number of classes that can be used
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for image enhancement.
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Example: Vary the sharpness of an image
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---------------------------------------
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::
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from PIL import ImageEnhance
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enhancer = ImageEnhance.Sharpness(image)
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for i in range(8):
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factor = i / 4.0
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enhancer.enhance(factor).show(f"Sharpness {factor:f}")
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Also see the :file:`enhancer.py` demo program in the :file:`Scripts/`
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directory.
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Classes
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-------
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All enhancement classes implement a common interface, containing a single
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method:
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.. _enhancement-factor:
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.. py:class:: _Enhance
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.. py:method:: enhance(factor)
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Returns an enhanced image.
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:param factor: A floating point value controlling the enhancement.
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Factor 1.0 always returns a copy of the original image,
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lower factors mean less color (brightness, contrast,
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etc), and higher values more. There are no restrictions
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on this value.
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.. py:class:: Color(image)
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Adjust image color balance.
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This class can be used to adjust the colour balance of an image, in a
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manner similar to the controls on a colour TV set. An
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:ref:`enhancement factor <enhancement-factor>` of 0.0 gives a black and
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white image. A factor of 1.0 gives the original image.
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.. py:class:: Contrast(image)
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Adjust image contrast.
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This class can be used to control the contrast of an image, similar to the
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contrast control on a TV set. An
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:ref:`enhancement factor <enhancement-factor>` of 0.0 gives a solid gray
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image, a factor of 1.0 gives the original image, and greater values
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increase the contrast of the image.
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.. py:class:: Brightness(image)
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Adjust image brightness.
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This class can be used to control the brightness of an image. An
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:ref:`enhancement factor <enhancement-factor>` of 0.0 gives a black image,
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a factor of 1.0 gives the original image, and greater values increase the
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brightness of the image.
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.. py:class:: Sharpness(image)
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Adjust image sharpness.
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This class can be used to adjust the sharpness of an image. An
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:ref:`enhancement factor <enhancement-factor>` of 0.0 gives a blurred
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image, a factor of 1.0 gives the original image, and a factor of 2.0 gives
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a sharpened image.
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