Citation :
You see, IE doesnt use a correct gamut setting, thus PNG images will appear darker; and back when Photoshop 5.0 and 5.5 gave incorrect gAMA chunks to PNG images it only aggravated the problem further. But since Adobe fixed the PNG gAMA chunk problem in Photoshop 6.0+, the current problem lies entirely with IE. But there is a way to do a short term fix for it.
Theres several PNG tools out there, but I use one called TweakPNG.
http://entropymine.com/jason/tweakpng/
To fix the gAMA problem simply remove the gAMA chunk altogether. Now PNG images will be displayed correctly in IE and still work in FF, NS, O, etc. Yet you can still take advantage of PNG alpha transparency and the smaller file sizes. Also consider removing cHRM, iCCP, and pHYs since they arent needed to display a PNG in a web browser either, and will make the final file size even smaller.
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