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Anonymous
Those rainbows are Moire fringes, the result of a bad interaction between the pixel scale of your scans and the dot pattern of the 4-color printed page. Try bumping the resolution WAY up (say 1200 DPI), and make sure your scans are saved in BMP or TIFF format (no compression). Open them in Photoshop or the GIMP, and scale them down to a more reasonable size; this should eliminate the "rainbow" problem.
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