On Thursday 16 June 2005 03:08 pm, Gerhard Fuernkranz wrote: > Hal V Engel schrieb: > >In the long run I am hoping that something like this will become available > > as an open source project. I believe that argyllcms is setup to do > > printer profiles but currently needs a spectrophotometer and is not setup > > to use a scanner. > > Argyll actually does support the use of a scanner as poor man's > colorimeter for printer profiling. But due to the well-known reasons, I > never got really good results (using an epson scanner with a CCFL lamp, > and an IT8.7 target as color reference). > > Regards > Gerhard
Cool I will have a look at it. My experience is that scanners with florescent lamps, which is most scanners, will have a significant amount of metamerism with some types of inks. The problem is particularly pronounced with pigment based inks like the archival inks I use but is much less of a factor with dye based inks. The problem is that the ink in the printer target and the IT8.7 target will exhibit different amounts of metamerism which results in the printer target and the IT8.7 target shifting by different amounts and in different directions. The effect varies for different inks, papers, lamps... and I suspect is almost impossible to compensate for with so many variables. The Canon LIDe 20 (and some other scanners) use three light emitting diodes (one each red, green and blue) that results in a light spectrum that is very close to sun light. This minimizes the affects of metamerism. I have never been able to get good results using a scanner with a florescent lamp with the inks that I use. Others on the ProfilePrism forums report getting good results using dye inks and scanners with florescent lamps. ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
