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Re: ISO-8613-6 sequences for RGB color

From: Thomas Dickey
Subject: Re: ISO-8613-6 sequences for RGB color
Date: Mon, 14 Jan 2019 20:32:56 -0500
User-agent: Mutt/1.5.23 (2014-03-12)

On Mon, Jan 14, 2019 at 10:46:34AM -0600, Bryan Christ wrote:
> Thomas,
> Is it possible to query the underlying terminal regarding a color?  I

not in general (xterm has escape sequences, but ncurses is general)

> assume it has to be possible since the following sequence has to be
> interpreted somehow.  It presupposes that a terminal would know what color
> Ps actually is.
> ESC [ 38 ; 5 ; Ps; m
> Hoping to work it backward, I've looked through the source code for ncurses
> to see how init_color() informs the underlying terminal but I'm not finding
> the relevant code.

in ncurses/base/lib_color.c around line 740, that's this chunk:

        CallDriver_4(sp, td_initcolor, color, r, g, b);
                      TPARM_4(initialize_color, color, r, g, b));

which sends the escape sequence.

Thomas E. Dickey <address@hidden>

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