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Re: Manipulate is sluggish?

• To: mathgroup at smc.vnet.net
• Subject: [mg83687] Re: Manipulate is sluggish?
• From: Tom Burton <news at brahea.com>
• Date: Wed, 28 Nov 2007 05:36:06 -0500 (EST)

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 ?