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Further explain GIF palettes combining

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Andrew Murray 2022-03-29 22:05:21 +11:00
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docs/handbook/image-file-formats.rst
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@ -109,9 +109,10 @@ GIF files are initially read as grayscale (``L``) or palette mode (``P``)
images. Seeking to later frames in a ``P`` image will change the image to
``RGB`` (or ``RGBA`` if the first frame had transparency).
``P`` mode images are changed to ``RGB`` because each frame of a GIF may
introduce up to 256 colors. Because ``P`` can only have up to 256 colors, the
image is converted to handle all of the colors.
``P`` mode images are changed to ``RGB`` because each frame of a GIF may contain
its own individual palette of up to 256 colors. When a new frame is placed onto a
previous frame, those colors may combine to exceed the ``P`` mode limit of 256
colors. Instead, the image is converted to ``RGB`` handle this.
If you would prefer the first ``P`` image frame to be ``RGB`` as well, so that
every ``P`` frame is converted to ``RGB`` or ``RGBA`` mode, there is a setting