Marti: I need to generate a printer profile. Help! :-)
I know that in the past you've said that printer profiles are difficult to make. But unless you tell me that "difficult" means "impossible", I have to try. I need the profile because currently I have to make several test prints before getting a decent final print. The printer driver I'm using (GIMP, gimp-print, espson/print-escp2 ) has controls for cyan, magenta, yellow, and gamma. Every print requires different, unpredictable, settings for these, and even then it's often impossible to match all the colors in the print to the CRT. I'm not surprised: Color management systems *are* necessary, and matrix color correction (not just R/G/B lutting) is required. I finally found a profile from Epson, but it's worthless. It's obviously for their Windows driver and for an unknown type of paper, but I had hoped it would have some useful colorspace shaping. In fact, it's simply a monochrome gamma adjustment. From experience (above) I know that significant color shifts are required. Back to LCMS. I know you've talked about the difficulties of CMYK undercolor removal, and also about error concatenation when using an input device (scanner in my case) plus profile rather than a real colorimeter to measure an output device. But I need an RGB-to-RGB (not RGB-to-CMYK) profile, and even an approximate profile would be better than none. I've been reading the lprof cmsscn.c source. Is this a useful starting point? From what I see, I'd need to change from icSigInputClass to icSigOutputClass, and all the AToB0 tags to BToA0. (I still find these confusing. Why couldn't the ICC have called them DevToPCS and PCSToDev?) (Can a CMS "invert" a profile -- turn an AToB transform into a BToA -- if the profile doesn't have both?) Again, I'm desperate to make a profile, and am willing to code/hack/experiment to do so. But if you can say in advance that it just won't work given the current state of LCMS, I don't want to waste the time. As always, thanks for any advice. Or do you have a pre-pre-alpha version of the printer profiler that you'd like to have tested? :-) ===== -- MARK [EMAIL PROTECTED] __________________________________________________ Do you Yahoo!? Yahoo! Tax Center - forms, calculators, tips, more http://taxes.yahoo.com/ ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
