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From: Richmond <dnomhcir@gmx.com>
Newsgroups: comp.misc
Subject: Re: What Is The Point Of Dark Mode?
Date: Fri, 21 Feb 2025 15:35:32 +0000
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Anton Shepelev <anton.txt@g{oogle}mail.com> writes:

> Richmond:
>
>> But this web page presents a different view.
>>
>>   https://www.visualexpert.com/Resources/cfaqPart6.html
>>
>> In the examples of the word "hello" blue on black looks quite clear
>> to me, but then so does black on white. But blue on red and red on
>> blue are disasters.
>
> While working on a NetPBM tool for the adjustment of saturation[1], I
> learned a bit about colors, partly from direct experience.  In the RGB
> triplet, blue is the darkest color and green the lightest.  Perceived
> saturation is an inverse[2] relation to perceived brightness.  The six
> main colors in the order of increasing brightness and (generally)
> decreasing saturation are: BRMGCY, with blue the darkest and yellow
> the lightest color.
>
> Blue on black is bad because of poor contrast, as well as pure red on
> pure blue, and yellow on white.  Also see how ugly green on white on
> that page is -- the exact combination in the default colorscheme of
> Microsoft SQL Management Studio!
>
> Attempting to increase the brightness of blue by adding red and green
> quickly "dillutes" its saturation.  For this reason, good dark schemes
> tend to use bluish colors for the background or comments (for there
> may be more than one), and green-yellow collors for the foreground.
> Converselty, white schemes have to use dark colors for the foreground,
> which significantly decreases the variety of hues, and that is a
> serious disadvatage.  ____________________
>
> 1. Example:
>    <https://freeshell.de/antonius/img_host/pamaltsat-ex01-v.png>
>
> 2. The indefinite article is intentional, because it is a general
>    tendency rather than an exact analytical relation.

Another thing to consider though is that blue light refracts more than
redlight. So if eyesight is becoming poor, it may still be possible to
focus on blue writing without glasses, while red will no longer be
possible.