Hi, On Tue, Jul 16, 2002 at 08:25:06PM +0200, Rene Rebe wrote: > Speaking about the preview feature of xsane ... - for color scans > xsane does a scan with gamma=1 and creates a software preview when the > user modifes the gamma value. But for my avision backend the scanned > images are not as light as they are in the xsane preview. Although the > scan looks reasonable for the gamma value.
Same here for the mustek_usb backend. The preview is slightly brighter. > So is the software simulation much too light (because of the loss of > precision) or are the Avision scanners interpreting the values in a > different way I think, and so the scanned images are just too dark for > the gamma-table I send? The mustek_usb backend does the calculation in software. Maybe it's wrong but I think it just uses the gamma vectors as array like this: corrected_value = gamma_table [really_scanned_value] Bye, Henning
