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? allan -- "so don't tell us it can't be done, putting down what you don't know. money isn't our god, integrity will free our souls" - Max Cavalera
