Wolf Faust wrote:
Graeme: I agree, spectral characterization of a scanner most likely needs more than three dyes. I was surprised about the IEC 61966-8 standard for spectral characterization of scanners. This standard uses only a target simlar to the IT 8.7 target (same layout... just more highly saturated colors in order to help the calculation).
For it to work, I would expect it to be constructed using a wide selection of colorants, not combinations of 3. The IEC 61966-8 is meant to be such a chart. The main problem with this approach seems to be that the problem is highly under constrained, and some sort of normalization is needed to produce feasible looking spectral sensitivities. Two recent articles were presented at CIC12; "Spectral Characterization using Continuous functions" by Tomasz J. Cholewo and Steven F. Weed. The preceding article "Emissive chart for image calibration" by Jeffrey M. DiCarlo, Glen Eric Montgomery and Steven W. Trovinger was also avery interesting, different approach. Some comments at the conference were that the IEC chart seemed to be difficult to get hold of (your link provided a contact though.) Graeme Gill. ------------------------------------------------------- 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
