Hi, >1: I'm implementing YCbCr color profile support in ImageMagick and was testing this >with >two profiles:
>YCbCr 601 to Lab colorspace conversion profile (ycc601.icm) >YCbCr 709 to Lab colorspace conversion profile (ycc709.icm) >- found in (earlier?) distributions of LCMS. Using these on an YCbCr source image and >converting to sRGB colors, the converted image looks terrible with almost all colors >wrong. >For example, converting black (0,0,0) gives the RGB color (15,91,0). This was with >v1.10. You can still find these profiles among others in http://www.littlecms.com/profiles.zip And this works fine to me... just as example, libtiff site has a sample of non subsampled YCbCr TIFF that can be handled by tifficc ftp://ftp.remotesensing.org/pub/libtiff/ycbcrbug11.tif Then, doing tifficc -iYCC709.icm ycbcrbug11.tif out.tif Gives out.tif in sRGB and colors looks fine. :-? Also my other YCbCr test TIFF works fine. Probably this profile is intended for TIFF and is holding encoded values. YCbCr is not very standarized at all. What I do not undestand is why SWOP doesn't work... I'm using CMYK conversions almost everyday without problems. Anyone else has experienced that? >2: I'm also working on adding a postscript CSA to EPS files generated with >ImageMagick. EPS files >with CSA's from LCMS look great. Colors are excellent! But I can't make it work with >the small bit >of postscript code in the end of the CSA: > > > /Current exch /ColorSpace defineresource pop Yep, I did in such way because I needed in such way :-) but I could try to make things easier. Any suggestions? Regards, Marti. ------------------------------------------------------- This SF.Net email sponsored by: Free pre-built ASP.NET sites including Data Reports, E-commerce, Portals, and Forums are available now. Download today and enter to win an XBOX or Visual Studio .NET. http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01 _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
