Hi, 0.5white doesn't work in CMYK properly (it's equivalent to 0.5*(0,0,0,0) = (0,0,0,0) = white) 0.1black doesn't work in RGB (it's 0.1*(0,0,0) = (0,0,0) = black) So your formula produces 50% gray in RGB and 10% gray in CMYK. No idea why you got 10% gray in some RGB setups, some test data would be needed. To get 10% grey colour you need to use 0.1[white,black] which works in all RGB, CMYK and Grayscale. Cheers Martin On Tue, Aug 10, 2021 at 11:29 AM Bruce Mutton <bruce@tomo.co.nz> wrote:
Curious
I have in my layout some metapost code to redefine the plan gridlines, used without apparent problem for perhaps 10 years. It includes a colour specification…
withcolor 0.1black+0.5white;
Mostly they come out like this, very light grey. This example is exported using colour-model cmyk, but most of the time using colour-model rgb it looks exactly the same, in my current project (only variables are colour map-fg, some map previews on or off and the colour model).
For some reason, in my current project, if I use colour-model rgb for a particular output variant, I get a much darker gridline, as below. Other variants with rgb, the colour of the gridline matches the first example.
Any hints as to why the difference?
I might have expected this to occur with the new cmyk colour model, but it does not.
So far it has only happened with in a single specific case when using the rgb colour model. I’ll watch for more cases…
Bruce
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