stef wrote: > gamma tables are 256 SANE_Int values wide, and values must range from 0 > to > 255. The gamma-table is for grey scans, and the three others for color scans. > So > you'll have to assign values according to the scan you are doing. > The default gamma tables are fine, and you can get good scans without > using > gamma tables.
well, the size of the gamma table and the the range of the allowed values depend on the backend and on the scanner. For a scanner with a 10 bit ADC it is reasonable to use a table with 1024 entries. Some other scanner with a 12 bit ADC may map 12 bit input value to 12 bit output values, so that the table has 4096 entries where each value may be in the range 0...4095 Abel
