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StretchDIBits and StretchBlt adds artifacts to my image

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i have several dib images that i got from a frame capture using directshow. i tried drawing the dib directly using StretchDIBits and by converting it to a DDB and doing StretchBlt but both makes ugly artifacts. http://thuned.xtron.net/pub/artifact.jpg look at either side of the head. the bigger one is the original and the smaller one is the one i shrunk w/ stretchdibits/stretchblt. the shrunken one has ugly red/green pixels around the head. how can i solve this problem?

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