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 <[email protected]> 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 > > > _______________________________________________ > Therion mailing list > [email protected] > https://mailman.speleo.sk/listinfo/therion >
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