Marti wrote: >> I'm scratching my head over how to invert a LUT. > > Mike, > > That is indeed a very difficult topic. For properly inverting a LUT > you have to know the gamut boundaries, and then proceed differently > inside or outside gamut. I have done some experimentation with > generalized Newton on n dimensions using Jacobians. Works well if the > gamut hull is convex and the lut is "smooth" enough. You have to > extrapolate ouside gamut. I have used > a polinomial approach here, with little succes I should add :-( > > lcms does not have such code, there is no need to do that strictly > following ICC > spec. However, I would be interesting as a future addition, since > this would solve > the issue about limited precission BToAxx tags exhibit...
Thanks for your answer - is this then a generally unsolved problem, or do proprietary solutions exist? Mike Russell www.curvemeister.com www.geigy.2y.net ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Lcms-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lcms-user
