GNU bug report logs - #66538
29.1; Green is darker with PGTK

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Peter Oliver <lists.gnu.org <at> mavit.org.uk>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.1; Green is darker with PGTK
Date: Sat, 14 Oct 2023 14:05:20 +0100 (BST)

[Message part 1 (text/plain, inline)]

In X11 Emacs builds, Emacs uses colours as defined by X11.

With PGTK, gdk_rgba_parse is called, which calls pango_color_parse_with_alpha, which uses the colour specifications from CSS (https://www.w3.org/TR/css-color-4/#named-colors).

The CSS colours are almost but not quite the same as the X11 colours (https://en.wikipedia.org/wiki/X11_color_names#Clashes_between_web_and_X11_colors_in_the_CSS_color_scheme discusses this).  Most notably, I find that X11 green is easy to read on a dark background, whereas CSS green is not.

I notice that X.org’s rgb.txt now contains a number of new colours related to this, compared to the rgb.txt bundled with Emacs.  For example:

   0 255   0            green
+  0 255   0            lime
+  0 255   0            x11 green
+  0 255   0            X11Green
+  0 128   0            web green
+  0 128   0            WebGreen


Possible ideas:

- Replace references in the Emacs source code to “green” with “lime”, “purple” with “x11 purple”, etc. (but would this work for users with old X servers?)
- Replace references in the Emacs source code to green with #00ff00, etc.
- Hack function color-values, say, to hard-code green to be #00ff00, etc.

-- 
Peter Oliver

Message #8 received at 66538 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Peter Oliver <lists.gnu.org <at> mavit.org.uk>, 66538 <at> debbugs.gnu.org
Subject: Re: bug#66538: 29.1; Green is darker with PGTK
Date: Sat, 14 Oct 2023 12:24:45 -0700

Peter Oliver <lists.gnu.org <at> mavit.org.uk> writes:

> I notice that X.org’s rgb.txt now contains a number of new colours
> related to this, compared to the rgb.txt bundled with Emacs.  For
> example:
>
>     0 255   0            green
> +  0 255   0            lime
> +  0 255   0            x11 green
> +  0 255   0            X11Green
> +  0 128   0            web green
> +  0 128   0            WebGreen

I updated the version in our tree (on the master branch) to match the
one in X.Org.

[1: 11f10dc0d0b]: 2023-10-14 21:23:57 +0200
  Update etc/rgb.txt from X.Org upstream
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=11f10dc0d0b4b1d6af828102421eac9f79e0fcba

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