Quoting Mark <d...@cine-scan.com>: > [snip] > Very interesting! > > What parameters are needed to get a transform as CLUT without > prelinearization tables - always?
You have not to worry about that. Just use cmsSliceSpaceFloat(). This function will call your callback on each node. It will give you the RGB to index the node as a parameter. All what you have to do is feed those RGB across the color transform, no matter how it is implemented, and then you will get the node value. *That* simple. > Is it also possible to build a CLUT to Lab PCS? Certainly. > Any reason why that should be avoided? Because gamut of both spaces are different. RGB to Lab is Ok, Lab to RGB you would need lots of nodes, since RGB would take just a small zone in the center. Thetrahedral doesn't work well in this case and you need trilinear. > And XYZ? How many grid points would be needed to get reasonable precision? XYZ apparent gamma is 1.0, so you need many nodes if gamma of destination space is 2.4 or more. 33 or even more to avoid quantization in shadows. But those are corner cases. Normal GPU color management goes RGB to RGB. Regards Marti ------------------------------------------------------------------------------ ThinkGeek and WIRED's GeekDad team up for the Ultimate GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the lucky parental unit. See the prize list and enter to win: http://p.sf.net/sfu/thinkgeek-promo _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
