GNU bug report logs - #74055
31.0.50; color-lighten-name not lightening black

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Package: emacs;

Reported by: Gerd Möllmann <gerd.moellmann <at> gmail.com>

Date: Mon, 28 Oct 2024 08:29:02 UTC

Severity: normal

Found in version 31.0.50

Fixed in version 31.1

Done: Gerd Möllmann <gerd.moellmann <at> gmail.com>

Bug is archived. No further changes may be made.

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From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: 74055 <at> debbugs.gnu.org
Subject: bug#74055: 31.0.50; color-lighten-name not lightening black
Date: Mon, 28 Oct 2024 09:27:29 +0100

The function color-lighten-name doesn't work as I would expect for
black:

  (color-lighten-name "#000000" 50)
  => "#000000000000"

I think there is even a test that checks that, in color-tests.el:

(ert-deftest color-tests-lighten-name ()
  (should (equal (color-lighten-name "black" 100) "#000000000000"))

I don't understand this, and it is different from what I'd expect, and
tools for the web return, for example

  https://mdigi.tools/lighten-color/#000000

In GNU Emacs 31.0.50 (build 1, aarch64-apple-darwin24.0.0, NS
 appkit-2566.00 Version 15.0.1 (Build 24A348)) of 2024-10-28 built on
 pro2
Repository revision: ea685170063b59855322ceffdeaaab4acaf8e388
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2566
System Description:  macOS 15.0.1
This bug report was last modified 277 days ago.

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