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Re: Manipulate is sluggish?
Yes, one objective was to show that my home-spun conversion formula is wrong or inconsistent with Mathematica. I derived it from an inverse formula, also "wrong", pulled from the Internet (http:// www.codeproject.com/tools/xcmyk.asp). ToColor seems not to work with symbols. I'll try to infer the correct formulas by studying numerical outputs of ToColor. I hadn't known of ToColor. Thanks for bringing it to our attention, however, I hesitate to use or recommend ToColor to others in this group. ToColor seems to be one those twilight functions that is documented in the kernel but not in on-line help. I can find it neither in v5's Master Index nor via v6's search box. Perhaps we are "not supposed" to use it? But we use what we must :-) Meanwhile, I hope someone can address the subject of my posts. Thanks in advance. Tom When responding, please replace news with my first initial and full last name, as one word. Tom Burton > you are sure that you need RGBColor@@cmyk2rgb[c,m,y,k] > > and not the build in version > > ToColor[CMYKColor[c, m, y, k], RGBColor] > > ?? > > Or do you just want to show that you conversion is wrong ?