If you can reproduce random colours with a new or old therion build you can send me some testing data. Otherwise you can send me some old PDF files with good and wrong colours.
M. On Wed, Aug 11, 2021 at 9:16 PM Bruce Mutton <br...@tomo.co.nz> wrote: > Thanks Martin > > Highlights the dangers of absorbing a language by osmosis. A false sense > of understanding! > > I’ll try that out and see how it works. > > > > Out of interest I went back over old maps to check the colour of my > gridlines. Until a few weeks ago I only ever used the default rgb colour > model, and even now I only specify rgb, but occasionally force Therion to > convert by specifying a cmyk colour model. I found that I actually got a > random section of the two gridline output colours over previous years. My > excuse for not picking it as a Therion behaviour is that I routinely use a > number of pdf viewers and printers. They all present line thicknesses and > colours slightly differently. Especially Sumatra pdf compared to most > others. > > > > Bruce > > > > > > *From:* Therion <therion-boun...@speleo.sk> *On Behalf Of *Martin Budaj > *Sent:* Wednesday, 11 August 2021 07:23 > *To:* List for Therion users <therion@speleo.sk> > *Subject:* Re: [Therion] Plan gridline colour changes unpredictably > > > > 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 <br...@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 > > > > _______________________________________________ > Therion mailing list > Therion@speleo.sk > https://mailman.speleo.sk/listinfo/therion > > _______________________________________________ > Therion mailing list > Therion@speleo.sk > https://mailman.speleo.sk/listinfo/therion >
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