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Just bought an HP OfficeJet Pro 9730, I do pencil drawings and need those scanned for my work, but the quality is very poor , the scanning software don't have a way to adjust brightness, contrast and gamma so a lot of the information of the scanning image is lost, is there a way to fix that and have those adjustment features?  Already tried with HP Smart and Twain printing on my Mac mini, also compared the scanning with my old Epson scanner and the difference is light and day, Epson image way much better with rich graytones. 

 

If someone could help I really appreciate it.

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