GNU bug report logs - #41544
26.3; Possible incorrect results from color-distance

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Package: emacs;

Reported by: Simon Pugnet <simon <at> polaris64.net>

Date: Tue, 26 May 2020 16:34:01 UTC

Severity: normal

Tags: patch

Found in version 26.3

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Message #121 received at 41544 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: 41544 <at> debbugs.gnu.org, drew.adams <at> oracle.com
Subject: Re: bug#41544: 26.3; Possible incorrect results from color-distance
Date: Sun, 07 Jun 2020 17:30:04 +0300

> From: Mattias Engdegård <mattiase <at> acm.org>
> Date: Sun, 7 Jun 2020 11:13:01 +0200
> Cc: Eli Zaretskii <eliz <at> gnu.org>, 41544 <at> debbugs.gnu.org
> 
> The predicate should work with the argument both as a foreground and as a background colour, for selecting a black or white contrasting colour. The assumption is that the same predicate can be used for both, which may be wrong, but absent evidence to the contrary, I think it is a reasonable one to make.

IME, it is unreasonable to assume that a pair of colors will be
perceived as "contrasting enough" no matter which of them is
foreground and which background.  Background colors affect larger
portions of display, and therefore a bright background is perceived as
brighter and a dark background as darker, than when the same color is
used as foreground.
This bug report was last modified 5 years and 33 days ago.

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