[Therion] Blue-colored water

[Martin Budaj]

You can check whether the problematic color rendering is caused by the
handling of transparency in the viewer if you set "transparency off"
in the layout.

Martin

On Sat, Nov 16, 2024 at 2:58 PM Bill Gee <bgee at campercaver.net> wrote:
>
> Hi Pavel -
>
> I wondered about trying CYMK colors instead of RGB.  Thanks for the hint
> on how to do it.
>
> The web site https://colorcodes.io is useful.  CYMK codes have to be
> converted from 0-255 range to 0-100 range, but that is pretty easy.
>
> I tried several combinations.  [100 0 0 0] comes out as cyan, a sort of
> light blue.  [97 84 0 4] comes out just about the same as what I
> currently get.  Back to RGB,  [3 15 96] looks almost black.
>
> All of this is using Okular as the PDF viewer.  I asked one of my caving
> friends to check my maps on his system.  Using Windows 10 and Adobe
> Acrobat he reports that the water areas in my maps are a nice shade of
> blue.  That is using [0 0 100].
>
> I think what this means is that Adobe Reader is the only PDF viewer that
> will properly render the colors, and that is probably because of how it
> handles transparency overlays.
>
> For my maps - I think I am going to carry on with [3 15 96] for water
> and [100 86 66] for map-fg.  That should be about the same color as
> "Blue Screen of Death" in Windows.  The rendering in Okular is not
> ideal, but it is readable.
>
> ===============
> Bill Gee
>
> On 11/16/24 05:41, Pavel Herich wrote:
> > Have you tried this in CMYK rather than RGB?
> >
> >
> > symbol-color line water-flow [100 0 0 0]
> >
> > or
> >
> > color-model cmyk
> >
> >    def a_water (expr p) =
> >      T:=identity;
> >      thfill p withcmykcolor (1,0,0,0);
> >    enddef;
> >
> >
> >
> > Pavel
> >
> >
> >
> >
> >
> > Dňa 2024-11-15 22:00 Bill Gee napísal(a):
> >> Well, this is interesting1  I changed the line in thconfig to green as
> >> Bruce suggested.  The water areas come out as a rather light green,
> >> not a fully saturated color.  Changing it back to red {0 0 100] gives
> >> a sort of light black color.
> >>
> >> Looking in the thbook, I see that color in this syntax is an RGB
> >> triplet.  I think the range for each triplet is 0 to 100.  Is that
> >> right?  I tried setting it to [0 0 200] but Therion tossed an error
> >> message about that.
> >>
> >> Just for testing, I commented out another line in the layout section:
> >>
> >>     color map-fg [100 86 66]
> >>
> >> With that change I now get very light blue water and a white background.
> >>
> >> It seems there is an interaction between the map-fg color and the area
> >> color.  I tried adjusting the the map-fg colors, assuming that lower
> >> numbers would be paler colors.  Nope!  Using [50 43 33] gave a dark
> >> brown background, and using [25 20 16] gave an almost black background.
> >>
> >> I set the map-fg colors back to original, then changed the water area
> >> color to [0 0 10].  The result is almost black.
> >>
> >>
> >> ===============
> >> Bill Gee
> >>
> >> On 11/15/24 14:06, Bruce Mutton wrote:
> >>>> In the thconfig file I have this line in the layout section:
> >>>>     symbol-color area water [0 0 100]
> >>>
> >>> Bill, have you tried
> >>> symbol-color area water [0 100 0] #green
> >>> and similar for the metapost?
> >>>
> >>> Sounds like all your pdf viewers are telling you something.  That the
> >>> lines are not used in your thconfig, or they are being superseded by
> >>> a subsequent contradictory entry :)
> >>> Bruce
> >>>
> >>>
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