😁(NewQuant): add color_map_alpha for the tRNS chunk in the PNG format #23
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Signed-off-by: Benign X <[email protected]>
W-Mai
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It won't hurt to add this, but I'm not sure if it's useful. In PNG there's a micro-optimization: put transparent colors first, so that tRNS can be shorter than the palette. So you'd probably rather get RGBA colors out of it, sort them, and then build palette and tRNS. |
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It's useful for transparency used in the tRNS chunk of the PNG format.
When writing PNG, the alpha channel and the RGB channel are separate, and the alpha channel is in the tRNS chunk.
S0, it's useful in this case.