Groups > comp.graphics.apps.gnuplot > #2667

Re: gnuplot chromaticity diagrams

From	Dale <dale@dalekelly.org>
Newsgroups	comp.graphics.apps.gnuplot, sci.engr.color, sci.image.processing, rec.photo.digital
Subject	Re: gnuplot chromaticity diagrams
Date	2014-12-11 04:40 +0000
Organization	Dale
Message-ID	<827som.o77.17.1@news.alt.net> (permalink)
References	<82458a.7j5.17.1@news.alt.net> <548868c6$0$2956$e4fe514c@news2.news.xs4all.nl>

Cross-posted to 4 groups.

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On 2014-12-10, Alex van der Spek <zdoor@xs4all.nl> wrote:
> On Tue, 09 Dec 2014 18:40:40 +0000, Dale wrote:
>
>> I've been hacking at chromaticity diagrams with gnuplot
> Netpbm's ppmcie does that nicely. Use ppmwheel for a HSV colour wheel.
>
> http://netpbm.sourceforge.net/doc/ppmcie.html
>
> Pipe the output to one of netpbm image convertors, write, say an PNG.
>
> Plot the PNG as rgb image overlaying it on a gnuplot plot.
>
> Alex

Thanks Alex, a treasure of programs.

I can get a single xy RGB gamut within CIE with ppmcie alone.
without gnuplot, I'll add this to my list of HOWTOs on my site
in my signature

I can also get u'v', and non-709 RGB spaces

a multiplot mode would be nice, not limited to the CIE spectral locus
with non-Maxwell spaces too

a profile attacher would be nice for non-709 and non-Maxwell spaces
(projectors, printing, data you want in non-clipped input space, etc.)

maybe I can get these in different parts of netpbm

what I get with gnuplot is multiple plot comparisons, if just
for white point changes, gnuplot gives me mixing and other editing
views too, I think, I have more systems than science experience and
am trying to combine the two

rgbimage in gnuplot's one mode uses a 5 column file x,y,r,g,b, whereas
the ppm file default is 512x512 pixels

someone else suggested samples, and isosample settings

it will take me some time to figure out rgbimage, don't know if I
can get rid of the black background in the ppmcie file though





>
>> http://www.dalekelly.org/gnuplot_xy.html
>> 
>> kind of stuck with how to fill them with color
>> 
>> seems to be related to the point color maybe, or the palette or
>> rgbimage, XYZ is a valid rgbformulae and my preference
>> 
>> the "whole" chromaticity diagram is bigger than what can be viewed on
>> the monitor
>> 
>> the sRGB inside the whole should be viewable on the monitor
>> 
>> anyone know gnuplot and how to fill these? I'll be studying in the mean
>> time
>


-- 
(my whereabouts below)
http://www.dalekelly.org

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Thread

gnuplot chromaticity diagrams Dale <dale@dalekelly.org> - 2014-12-09 18:40 +0000
  Re: gnuplot chromaticity diagrams Olaf Schultz <o.schultz@enhydralutris.de> - 2014-12-09 20:24 +0100
  Re: gnuplot chromaticity diagrams Karl <mail.kfr@gmx.net> - 2014-12-09 20:52 +0100
  Re: gnuplot chromaticity diagrams Alex van der Spek <zdoor@xs4all.nl> - 2014-12-10 15:37 +0000
    Re: gnuplot chromaticity diagrams Dale <dale@dalekelly.org> - 2014-12-11 04:40 +0000
      Re: gnuplot chromaticity diagrams Olaf Schultz <o.schultz@enhydralutris.de> - 2014-12-16 16:02 +0100

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