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January 20, 2009 at 8:01 pm #24754
You can set the scanner to scan in RGB colorspace in TWAIN, then you can convert that data to grayscale as you wish. Look for the pixeltype declarations in TWAIN.H and the specs. You might be able to scan directly in grayscale if you only need that. The value for RGB is TWPT_RGB and TWPT_GRAY for grayscale if I remember correctly.