Peter Kirchgessner <[email protected]> writes: > You can start xscanimage and switch to matrix-type Custom. Then you see what > is used to enter the values for matrix-rgb. This was the reason why custom > matrix has been disabled. Using 9 sliders would be an alternative.
when scanning in greyscale, the selection is a 3D vector. It might be good to have (as the GUI element) something like a view of a semisphere of the unit ball in the RGB space, and have it rotated directly by the trackball (yes i don't use mouse). This way you just select the color of the background (which you don't want) and ....
