-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 m. allan noah wrote: > recent model fujitsu scanners dont have native brightness/contrast/gamma > support, instead they use an 256x256 or 1024x256 bit look up table to > convert the raw scan data before 8 bit output. > > while it is true that the 8bit square LUT could be done after scanning > with no data loss, most command line front-ends dont do this, and the 10 > bit lut has 'access' to more data that never gets out of the scanner, so > i would like to extend the backend to provide at least > brightness/contrast for these scanners. > > i need suggestions or pointers to code that i could use. what things i > can find are far over my head, but i have a simple brightness adjustment > that shifts the linear slope of the in-out function up or down, and a > crude contrast setting that changes the slope of the function around the > center of the table. i think both of these methods are likely too > simplistic. > > anyone?
As far as I know, xsane automatically calculates and downloads a gamma table for brightness / contrast / gamma if the backend advertises it. Bertrik -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFEvRIlETD6mlrWxPURAtQfAJ0Z9F+lAP8mh96E7fRkJuHuMmu8vgCgpP/l PWk5WXjsUe/hYPEV47QbbFw= =sNyM -----END PGP SIGNATURE-----
