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RE: How does Emacs know the background color?

From: Zaretskii Eli
Subject: RE: How does Emacs know the background color?
Date: Tue, 18 Feb 2003 08:41:42 +0200

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> From: Michael Herman [] 
> Sent: Sunday, February 16, 2003 4:11 PM
> I am using a special mode for handling e-mail called post.el.  In
> post.el there are different faces depending on the background being
> 'light' or 'dark'.  When I launch emacs -nw from within an xterm with
> a white background, emacs uses the face for a dark background.
> How does emacs determine what the background is?

It looks for an environment variable defined by xterm.  See startup.el
for more details.

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