In article <39115C75.19BC1A37@aetec.ee>, Vahur Krouverk 
<vah### [at] aetecee> wrote:

> No, basically this are as easy as that (RGB->CMY):
> C = 1 - R
> M = 1 - G
> Y = 1 - B
> In case of CMYK K is computed as minimum from C,M,Y and each component
> (CMY) is reduced by this value.

Ok, then there already exists a filter which can do most of the 
conversion: invert. You could then get K using the "min" filter.(which I 
haven't written yet)

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Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
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