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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: min-colors 88
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> Date: Thu, 27 Jan 2022 19:46:09 +0100 (CET)
> From: fatiparty@tutanota.com
> Cc: Help Gnu Emacs <help-gnu-emacs@gnu.org>
> 
> For instance #RRGGBB, #RRRRGGGGBBBB.  As I understand there is no relation
> between thu possibilities provided by the hex-codes and the lookup table of actual
> colours that can be rendered.

The relation is established at startup, you can see the code in
xterm.el.