On 11/03/2016 05:59 PM, marti.ma...@littlecms.com wrote: > You are right, gamut check was not intended to work in unbounded mode > and also, due to the way it works, it needs a space perceptually uniform > to perform good. This is because gamut check uses a LUT driven by CIE > L*a*b* to hold the distance of each color to gamut boundary. Works well > for traditional 8-bit imaging but definitevely not for linear spaces > close to XYZ. > > This is not a bug, but a limitation due to the algorithm used. I take > two action items: fully de-activate gamut check on unbounded mode and > document the limitation. Will happen in 2.9
Hi Marti, Regarding "de-activate gamut check on unbounded mode", 1. Does this mean that in LCMS 2.9, if the source color space is capable of being used to encode out of gamut colors using floating point values, then the user won't be able to activate an LCMS gamut check? 2. Will the gamut check be de-activated even if the image itself is at integer precision, but the source color space itself does support encoding out of gamut floating point values? 3. Will the 2.9 code check to see if the source color space is a linear gamma color space, and then also de-activate the gamut check? Well, I guess usually there wouldn't be a need to check (depending on the answer to the first two questions), because parametric and gamma curve linear gamma profiles support floating point unbounded editing. Although there are linear gamma ICC profiles available that have 4096-point TRCs. No gamut check at all is probably better than an inaccurate gamut check. But soft proofing without the option to activate a gamut check does limit the information available to the user when preparing an image for conversion to another ICC profile. Best regards, Elle ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
