Shoutbox

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Originally posted by lhunath
If I understand this correctly, you want to add hidden data to the image colour palette. Entries which aren't refered to by the actual image data.

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correct

quote:

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Originally posted by lhunath
I don't think that'll work since when MSN Messenger converts the image to a RAW image, these entries which aren't used will be completely lost (as they have no representation in the visible content of the image). I don't think when Messenger converts images to RAW, that it also keeps track of all the palette entries, if any.

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I dunno... depends on how Messenger defines "raw". Palettes are part of raw image data in a sense. I dunno what the actual "raw image"-format looks like and if Messenger converts palette entries (pixelindex) to pixeldata (RGBA) or not. We know it strips most parts of the PNG, but do you know if it also strips the palettes? If so, then indeed that method will not work.


IIRC, but I can be wrong, then PNG's with alpha-palettes can have 65536 (!) possible values of the transparency instead of the 256 possebilities of the normal RGBA-method. So in a sense, if Messenger converts the alpha-palette to RGBA, it will loose information in the actual image, and I dunno if it does that or not... maybe trying to add a true alpha-palette enabled image to the DP's and checking it's format afterwards will tell this...