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Subject:
New release and Re: primax_scan.c gamma
From: ####@####.#### (Thomas Schano) Date: 17 Jan 2000 23:42:58 -0000 Message-Id: <3883A4F2.E1F25C66@t-online.de> Gustaf Kroling schrieb: > > Hello Marco and Thomas, > > The driver for Colorado Direct 9600 is now almost usable if > you think that > 100 dpi is the only resolution you need. :-) > > But I am confused by this gamma stuff. I could not get the > colours right > ( comparing with scans made with the primax software ) and > found that the > colourtable was different. After some digging the net and > even checking my > old textbook on tv I found that gamma is applied directly on > the normalised > signal, not on 'signal-.5' as it is done in > 'calc_color_table'. > > Any comments? Remember the driver is only an alpha-version! I think Marco did his best. As I remember he used the table from some scanns and tried to find a function correlating to it. Until the funktion that produces the color-tables is correctet (written like the definitions of gamma and so on says) use the funktions of GIMP or other image-tools to correct the gamma values. > > btw: when trying to change this I had some problems entering > the gamma value > in the command line. When parsed the gamma takes the value > of the brightness > and it is only the red colour that gets updated. Have I > broken something?? I don't think so. The function isn't debuged, yet. > > Gustaf Last but not least: There is a new alpha-release of the driver on my webspace at: http://home.t-online.de/home/schano/primax_scan.html Thomas | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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