I am running the following:

  • Ubuntu 18.04
  • Gnome Terminal
  • Tmux 2.6
  • Vim 8.0.1453

When running the following snippet,

awk 'BEGIN{
s="/\\/\\/\\/\\/\\"; s=s s s s s s s s;
for (colnum = 0; colnum<77; colnum++) {
    r = 255-(colnum*255/76);
    g = (colnum*510/76);
    b = (colnum*255/76);
    if (g>255) g = 510-g;
    printf "\033[48;2;%d;%d;%dm", r,g,b;
    printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
    printf "%s\033[0m", substr(s,colnum+1,1);
printf "\n";

I get a continuous color band when outside of Tmux, as opposed to when I run it inside Tmux.


set -g default-terminal "screen-256color"
set -sa terminal-overrides ",xterm*:Tc"

I also tried setting the second option to

  • set -as terminal-overrides ",xterm-256color*:RGB"
  • set -as terminal-overrides ",xterm-256color*:Tc"
  • set -ga terminal-overrides ",xterm-256color*:RGB"
  • set -ga terminal-overrides ",xterm-256color*:Tc"
  • set -as terminal-overrides ",*256*:Tc"

... and many more. I also tried removing the first setting altogether.

On a similar note, when running Vim inside Tmux with set termguicolors in .vimrc, I lose all colors.

The bottom line is that I cannot achieve what is referred to as "true color" in Tmux.

I am aware that there are many similar questions, but none offered a solution so far.


What does running tmux show -s terminal-overrides and tmux info|grep Tc inside tmux actually show? Are you sure you restarted tmux entirely after changing .tmux.conf?

RGB was not added until tmux 2.7, so you will need to use Tc.

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