Re: Black and white emacs -nw (WAS: Re: [PATCH v3 0/4] Support 24-bit terminal colors.)

[Kaushal Modi <kaushal.modi@gmail.com>]

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On Sun, Feb 19, 2017 at 7:43 AM Rami Ylimäki <rami.ylimaki@vincit.com>
wrote:

>
> XTerm supports the direct color mode escape sequences, but approximates
> colors. See
> https://gist.github.com/XVilka/8346728#parsing-ansi-colour-sequences-but-approximating-them-to-256-palette
> and https://gist.github.com/XVilka/8346728#now-supporting-truecolour for
> details.
>
> Note that if you want to use XTerm, then using TERM=xterm-256color with
> Emacs is enough, because 24-bit colors are approximated anyway.
>

Thanks for that explanation; it helps understand why the colors don't
exactly look as in 24-bit mode. But that is much better than 256 colors! :)


> I did not do a full bootstrap. But it still seems to work in uxterm in
> tmux configured for 24-bits.
> But it doesn't work directly in an xterm terminal.
>
> What debug information can I provide from the direct xterm session or
> xterm+tmux session?
>
>
> I haven't used tmux before, but I was able to make Emacs work in direct
> color mode with following steps:
>

Wow! I cannot thank you enough! I really appreciate the effort you went
through to help me get this working.


> * Use a terminal that supports 24-bit colors (gnome-terminal).
>

Thanks. I will try that. But for now, with your fixed terminfo with Tc, it
works great in xterm too.


> * Compile tmux from https://github.com/tmux/tmux.git. The version
> provided with Ubuntu doesn't support Tc-flag.
>



> * Use following terminfo source (add the Tc-flag and use semicolon
> separators for tmux):
>
> $ cat terminfo-24bit.src
>
> # Use semicolon separators.
> xterm-24bits|xterm with 24-bit direct color mode,
>         use=xterm-256color,
>         Tc,
>
> setb24=\E[48;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%dm,
>
> setf24=\E[38;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%dm,
>

Thank you! This fixed the color anomaly I reported in my last email.


>  * Compile the terminfo source, run tmux, set your TERM to xterm-24bits,
> check that Tc is supported:
>
> $ tmux info | grep Tc
>  199: Tc: (flag) true
>
> * Finally run Emacs under tmux.
>

Thanks again! :)
-- 

Kaushal Modi

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