I'm working with an HP Photosmart C4280 All-in-One printer/scanner/copier. I'm only using the scanner function at the moment. I'm working on an Ubuntu system, and using xsane and scanimage to capture images.
I am aware that I can use image processing programs, such as gimp, to modify the color balance and contrast of images after they have been captured. What I am hoping to do is a little different. Is there a way to actually change the way the scanner captures the image, such that the color balance or contrast comes out different?
There is a "Quality" button on the scanner, but changing it doesn't appear to change the captured images. The documentation for scanimage says it takes brightness and contrast parameters, but it's not clear whether those are applied after the fact to the captured image, and in any event, changing those parameters doesn't appear to have any effect.
xsane has parameters for gamma, brightness, and contrast, but they only seem to affect the preview image after the preview has been acquired, which makes me thing those parameters don't affect the scanner, but are applied to an image once it has been captured.
