GNU bug report logs - #33093
26.1, 7.2 emacs-mac; M-x list-colors-display RET; L1 is black on black

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Message #11 received at 33093 <at> debbugs.gnu.org (full text, mbox):

From: Van L <van <at> scratch.space>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 33093 <at> debbugs.gnu.org
Subject: Re: bug#33093: 26.1, 7.2 emacs-mac; M-x list-colors-display RET;
 L1 is black on black
Date: Sun, 21 Oct 2018 16:12:29 +1100

>> The *Colors* buffer has black text on color backgrounds that is not always readable.
> 
> Each color's name is shown twice, once when the color is used as
> background, the other time it is used as foreground.  Are you saying
> that you see neither of these two for some colors?

I see three columns. As an aside, previously my background color was ‘antique white’ now it is ‘gainsboro’. Back to here. The columns according to how I interpret them:

 1. text on color bar, this is the background-color, and the text is unreadable at line 1 (black on black)
 2. the same color as foreground-color, the black text is readable on my normal background color
 3. the RGB hex values

I am saying the problem is in column one where WYSIWYG background-color and text color are identical it is unreadable.

And, in cases, such as blue, medium blue, the column one’s presentation is difficult to read the black text.

>> I’d like to suggest color contrast arcs through a distorted triangle colorspace for choosing textcolor always in contrast to the background color for easy reading. In the case of black, blue, medium blue background the text color is white. Perhaps, only a dozen special cases are needed to switch black to white text color and the colorspace idea is overkill.
> 
> How will this work with our intent to show the color both as
> foreground and as background?

I’m suggest in column one, where the black text is too close to the background-color being demonstrated, such as blue, medium blue, that the text-color in column one should be inversed to white from black.

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