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GAA does not have this "coloring" effect. CT has it because this is the way it works: Every pixel on a TFT (and trinitron-like tube) consists of three horizontally aligned sub-pixels, being red, green, and blue (IIRC). So since every subpixel is one-third of the width of a full pixel, cleartype uses these (colored) subpixels to anti-alias fonts. This works because the eye can barely see the COLOR of those subpixels (because they're so small), but the BRIGHTNESS receptors in the human eye work a lot better. If you look closely, you'll notice the color, though - it's essentially an artificial convergence error.
GAA on the other hand (doesn't matter if it's just the standard windows GAA or if it's hardware accelerated, themethod is the same) uses full pixels, which display different shades of gray (for black characters on a white background) to anti-alias fonts. But pixels are relatively large, so this won't work on smaller fonts (they would look like bold fonts, and if you use any font at 12 pt. and make it bold, you'll notice it is indeed anti-aliased).
Hope this clears it up a little
AZ
GAA on the other hand (doesn't matter if it's just the standard windows GAA or if it's hardware accelerated, themethod is the same) uses full pixels, which display different shades of gray (for black characters on a white background) to anti-alias fonts. But pixels are relatively large, so this won't work on smaller fonts (they would look like bold fonts, and if you use any font at 12 pt. and make it bold, you'll notice it is indeed anti-aliased).
Hope this clears it up a little
AZ
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