PNG Transparency in IE 6
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01-12-2008, 11:12 PM
Join Date: Nov 2007
colorinformation == gamma
I disagree. I think that in this case the gamma is just a constant. Really just saying: "ok, see that color information there? Display it with this gamma level".
So setting that to 0 will neutralize the effect of the gamma level, but all the
color correction information
is still there.
So, technically we're both wrong.
We aren't really talking about "color information". The correct term (for what we are discussing) is "color correction information".
The main use of pngcrush is for reducing the size of the image data contained in the IDAT section.
pngcrush has one advantage over the other programs because it can remove all the color-correction data (gamma, white balance, ICC color profile, standard RGB color profile) from PNG files.....
... Since most graphics software embed the extra color-correction data, which is normally not needed, this can produce file sizes that are up to 40 % smaller than the original. Greater reductions come from PNG images that have 256 colors or less (indexed color).
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