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Originally Posted by grannyGrumpy
But reduced-color png brings us back to square one ---- the ADE engine in some devices can not properly render 2-bit (2-colors) or 4-bit (16 colors).
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Not necessarily, one thing is the number of colors, another thing is the number of bits used to store each color. You could have a plain grey image, that's just 1 color, but it cannot be stored as a 1-bit image (that's 2 colors, 2-bit would be 4 colors), because with 1 bit the colors are black and white (that is, unless we use an indexed mode, with a 2-color pallete, but 8 bits per color)...
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But the 256->16->256 png makes a pretty small file, so probably would be the way to go with images with low color count.
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That's basically what I mean. With 256->16 you reduce the number of colors to 16, with 16->256 you ensure that the colors are stored as 8-bit numbers.