R help - Nov 2020 - RGB -> CYMK, with consistent colors

On Sun, 29 Nov 2020 at 14:26, Derek Jones <gmane at knosof.co.uk> wrote:

[...]
> I can regenerate the images, and explicitly specify cmyk.  But using:
>
> pdf.options(colormodel="cymk")
>
> does not change anything.  The colors look remarkably similar to
> those produced via the ghostview route.
[...]
> Does anybody have any ideas for producing cmyk images that have
> the same (or close enough) look as the RGB?
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.

Regards
Martin

	[[alternative HTML version deleted]]

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.

-- 
Derek M. Jones           Evidence-based software engineering
tel: +44 (0)1252 520667  blog:shape-of-code.coding-guidelines.com