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			For what it's worth my scanner - Epson perfection 2400, with the updated version of the twain driver/scanning software - Auto corrects brightness depending on the object and background. It usually comes out accurate to what I see. The only thing I adjust is the DPI, but using different settings like document or  and I'm probably off on the numbers, 16 or 24 bit color will produce slightly different results. 
 Steve B
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