Re: [Lcms-user] lcms vs. libjpeg for CIELAB ITU-Fax T.43/T.42
An ICC-based CMM for color management
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From: Bob F. <bfr...@si...> - 2007-10-23 21:59:17
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On Tue, 23 Oct 2007, Hal V. Engel wrote: > > I find several references on the web to a CIELab ITU/Fax profile named > iitufax.icm but I was not able to find a copy of it. But if it is available > or if there are enough specifications to create one then using lcms to > convert between the normal colorspaces that we see used for most jpeg images > and CIELAB ITU-Fax T.43/T.42 in either direction should be almost trivial to > implement. Is it possibly this file from the lcms profiles collection? LCMSLABI.ICM little cms Relative L*a*b* identity profile WhitePoint : D50 XYZ=(1.0, 1.0, 0.8) Lab=(100.000, 0.016, -0.016) (x,y)=(0.346, 0.359) Hue=314.75, Chroma=0.02 or is FAX different? There is also: Tifflab8spac.icm TiffLab8Spac D65 (c) Linotype-Hell WhitePoint : D65 (daylight) XYZ=(1.0, 1.0, 1.1) Lab=(100.000, -2.379, -19.401) (x,y)=(0.313, 0.329) Hue=263.01, Chroma=19.55 Bob ====================================== Bob Friesenhahn bfr...@si..., http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ |