Quoting "Guy K. Kloss" <g.kl...@massey.ac.nz>:
> Good question. Which one does LCMS in a current version use? I'd > assume ICC V4 16 bit, but I'm not sure. The information provided has > been determined analytically as the simplest linear transformation > from Lab float encoding to Lab 16 bit encoding all within LCMS. lcms is a ICC color management engine, therefore it supports ICC V2 and ICC V4 Lab encodings. Details on such encodings are in the ICC spec. Also, there are some documentation on cmspcs.c, but as said, the main documentation source is the ICC spec. On the other hand, TIFF file format has two different Lab encodings, which are documented in TIFF 6.0 TTN2. It happes that photometric interpretation 9 is same as ICC V2 Lab in 8 bits (but not on 16) TIFF Specification Supplement 2 (PDF: 311k) March 22, 2002 Enhancements for Adobe Photoshop® software http://partners.adobe.com/public/developer/tiff/index.html Be careful on ICC Lab v2, because conversion 8 <-> 16 bits is done by multiplying/dividing times 256, as opposite to all other encodings that is done by times 257. ICC Lab V2 is a sort of fixed point. For converting between formats, take a look on tifficc, routines UnrollTIFFLab8 and PackTIFFLab8 Regards Marti ------------------------------------------------------------------------------ The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your production scanning environment may not be a perfect world - but thanks to Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700 Series Scanner you'll get full speed at 300 dpi even with all image processing features enabled. http://p.sf.net/sfu/kodak-com _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
