Comment 24 for bug 498029

"photo" scans with Canon LIDE 110 and 210 all come out with heavy "gray" background, and "over scan" so that the back sides of documents show through.

I don't think most simple-scan users are after full color correction, but just making "white not gray". I know this is complicated, but am holding out hope that there is some solution possible *for simple-scan* that will make it so users won't have to GIMP adjust every color scan.

The following askubuntu post seems to give a good summary of the problem:

http://askubuntu.com/questions/60688/is-there-a-program-that-can-edit-pdf-black-white-levels

I am guessing the user was doing a "photo" scan even though the document is gray / black / white.

Is there some way to include a checkbox "make white" or something like that? Maybe a pointer can be used to select what pixel could be "white". If user need other color corrections (reds / blues, etc) then not for simple scan. But the most simple uses of scanning color documents need to have "white" not gray backgrounds.