Printers are allway dependent on setup of colour management in its driver. Pro printers are dependent on setup of RIPs sending data to them. Not easy task.
Martin S. Odesláno z iPhonu 11. 8. 2021 v 21:15, Bruce Mutton <[email protected]>: > 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 <[email protected]> On Behalf Of Martin Budaj > Sent: Wednesday, 11 August 2021 07:23 > To: List for Therion users <[email protected]> > 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 <[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). > <image002.jpg> > > 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. > <image004.png> > > 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 > _______________________________________________ > Therion mailing list > [email protected] > https://mailman.speleo.sk/listinfo/therion
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