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Color palette for palette mapped images
:param mode: The mode to use for the palette. See:
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:param palette: An optional palette. If given, it must be a bytearray,
an array or a list of ints between 0-255. The list must consist of
all channels for one color followed by the next color (e.g. RGBRGBRGB).
Defaults to an empty palette.
:param size: An optional palette size. If given, an error is raised
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