On 6/14/10 7:52 PM, marti.ma...@littlecms.com wrote: > Quoting Richard Hughes<hughsi...@gmail.com>: > >> I'm playing around with using a ClutterShader to do full screen color >> management using GLSL on the GPU. I'm aiming to integrate the >> functionality into future versions of mutter for GNOME 3. > > Hi, if you can implement tetrahedral interpolation as a shader, you can > make color transforms to fly. The basis are not too complex, you need > to create a color transform from/to RGB first, Then by using > cmsSliceSpaceFloat(), build a 3D lookup table by evaluating your tranform > on each node. Then upload this table plus the image to convert into > GPU memory. 3D table of 17 points is enough for all but hardly non-linear > color spaces. 33 points should be enough for everything. As long as the > color transform is same (sRGB to monitor, for example) you can reuse > same table. Color transform may involve any intent and many profiles, > softproofing for example. > > Don't waste time implementing prelinearizations or weird things, > give first a try to this simple 17-points table. If tetrahedral > is hard to implement for you due to tetrahedra subdivision, use > triliner instead. > > Good luck. I know for sure this can be done and I know for > sure that it works.
Is the tetrahedral interpolation patented? I googled what 'tetrahedral interpolation' is because I had no idea and this patent popped up in the results: http://www.freepatentsonline.com/5581376.html tom ------------------------------------------------------------------------------ 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
