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Color types added to readme

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Niles Rogoff 2016-11-30 19:46:32 -05:00 committed by Niles Rogoff
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@ -79,3 +79,12 @@ Deletes all IDAT chunks except the first one, then sets that chunk's data to the
## Indexes
Any function that takes an index can be passed either the numerical index of the chunk (so 0 for IDAT, 1 for the second chunk, -1 for the last chunk, etc..), or a list that exists in `img.chunks`, or a 4-length bytes object that is equal to the label of one of the chunks in the image. If a chunk with that label appears more than once, the first one will be used
## Color types
The following color types are defined
GREYSCALE = 0
RGB = 2
PALETTE = 3
GREYSCALE_WITH_ALPHA = 4
RGB_WITH_ALPHA = 6