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bug#34001: 26.1.90; :distant-foreground face property fails to work in m

From: Daniel Colascione
Subject: bug#34001: 26.1.90; :distant-foreground face property fails to work in most cases
Date: Mon, 21 Jan 2019 18:09:39 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1

On 1/21/19 5:58 PM, Basil L. Contovounesios wrote:
Tina Russell <address@hidden> writes:

I’m not the only one who’s noticed this; there’s a good StackExchange
thread from 2015 here:
https://emacs.stackexchange.com/questions/7982/ The author notes that
there should be a user option to set the amount of “distance” (between
foreground and background colors) that is required for
distant-foreground to kick in

It would be nice if any work in this area took into consideration
existing efforts by Julien Danjou (CCed) in lisp/net/shr-color.el
(see e.g. user options shr-color-visible-luminance-min and
shr-color-visible-distance-min and function shr-color-visible).

For example, the library may end up either duplicating existing core
logic, or prove sufficiently useful that it is moved to a less
SHR-specific location (I'm just speculating).

, and adds that a good way to measure
color distance in real-world circumstances is described here:
http://web.mst.edu/~rhall/web_design/color_readability.html A commenter
suggested that he file a bug, but I can’t find an Emacs bug report
related to this issue, so I’m filing this now.

FWIW, there has been some discussion of colour distances in bug#25525
and bug#30295:


I think I had a proposal a long time ago to just call into lisp during redisplay in order to compute the color composition.

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