Peter Kirchgessner <pe...@kirchgessner.net> writes: > Hello Michal, > > you need to set mode color to use matrix-rgb. It is not available for > mode greyscale.
it should be available. Reference manual of HP SCL (v8.0) says: > on a color scanner, the grayscale data before being modified by the tone map > is taken from the output of the green channel going through the coefficient > matrix. So, where is the problem? ...so we need to to change just 1 row of the matrix. It would be nice to scan a color sample (let's say i have hundreds of documents written in red on green paper), select (in some GUI) the most suitable transformation RGB->greyscale (as a vector representing it), and then scan in greyscale! > Please tell me if it works. I never tried that. i've realized the importance of this matrix just after thousands of scans :( > Where did you find <pkir...@aol.com> ? This address is no longer valid. in sane-backends/backend/hp.README
