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extend documentation for PNG transparency

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Oliver Tonnhofer 2016-04-19 10:21:19 +02:00
parent c773688f37
commit eb0f400e02
1 changed files with 10 additions and 2 deletions
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docs/handbook/image-file-formats.rst
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@ -370,8 +370,13 @@ The :py:meth:`~PIL.Image.Image.open` method sets the following
Gamma, given as a floating point number. Gamma, given as a floating point number.
**transparency** **transparency**
Transparency color index. This key is omitted if the image is not a For ``P`` images: Either the palette index for full transparent pixels,
transparent palette image. or a byte string with alpha values for each palette entry.
For ``L`` and ``RGB`` images, the color that represents full transparent
pixels in this image.
This key is omitted if the image is not a transparent palette image.
``Open`` also sets ``Image.text`` to a list of the values of the ``Open`` also sets ``Image.text`` to a list of the values of the
``tEXt``, ``zTXt``, and ``iTXt`` chunks of the PNG image. Individual ``tEXt``, ``zTXt``, and ``iTXt`` chunks of the PNG image. Individual
@ -392,6 +397,9 @@ The :py:meth:`~PIL.Image.Image.save` method supports the following options:
For ``P``, ``L``, and ``RGB`` images, this option controls what For ``P``, ``L``, and ``RGB`` images, this option controls what
color image to mark as transparent. color image to mark as transparent.
For ``P`` images, this can be a either the palette index,
or a byte string with alpha values for each palette entry.
**dpi** **dpi**
A tuple of two numbers corresponding to the desired dpi in each direction. A tuple of two numbers corresponding to the desired dpi in each direction.