Martin,

Have you tried printed a few pages in CMYK?

A monitor is based on mixing light using Red-Green-Blue. So it is not
possible for the monitor to show
CMYK which must be printed on paper to view correctly.

Yes, I have printed some 'CMYK' pages.

The blue is very obviously not cyan, as compared to printing the
RGB version.

Let me correct the last sentence.
The printed blue is obviously not cyan when printing 'rgb' and 'cmyk'
pages.

Somebody pointed out in an email that probably I am the only one who
is going to notice the difference, and he may be right.

My frustration is that the printer supports cyan as a base color.
I understand that rgb->cmyk involves lots of variables, and I'm hoping
that somebody will point me at one that allows me to tweak the output.

library("colorspace")

two_c=rainbow(2)

x=runif(20)
y=runif(20)

plot(x, y, col=two_c[2])


pdf(file="cmyk.pdf", colormodel="cmyk")
plot(x, y, col=two_c[2])
dev.off()

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