How to enable true-color for neovim, tmux and gnome-terminal
With the release of tmux version 2.2 we’re able to get true-color support
inside of tmux. And because both neovim and gnome-terminal are also supporting
this, we can have great looking interfaces and colorschemes inside of tmux.
However, there are some steps we need to take in order to make this work.
So I created this blog post for future reference, and hopefully you might find
it useful too.
So lets start with gnome-terminal. First, we need to make sure that
gnome-terminal is version linked with
libvte >= 0.36. In order to check
this, run the following command, and if you have the correct version of
gnome-terminal. The version should be greater than or equal to
$ ldd /usr/lib/gnome-terminal/gnome-terminal-server | grep libvte
If this isn’t the case, we need to get gnome-terminal from the staging
ppa and install the latest version.
$ sudo add-apt-repository ppa:gnome3-team/gnome3-staging
$ sudo apt-get update
$ sudo apt-get install gnome-terminal
# the following will remove the staging repository because we only want to
# install gnome-terminal
$ sudo add-apt-repository -r ppa:gnome3-team/gnome3-staging
You might need to restart your computer or you could restart the
gnome-terminal-server. And, just to be sure, check if
libvte is the correct
Now, let’s check if we can really get the true-color spectrum. Download the
following script, and execute it.
# download script
$ wget https://raw.githubusercontent.com/robertknight/konsole/master/tests/color-spaces.pl
# make the script executable
$ sudo chmod +x color-spaces.pl
# run the script
It should look something like the following:
Optional: support for italics
I wanted to be able to have support for italics in tmux, and this
is how you do it. Create a file name
the following contents:
# A xterm-256color based TERMINFO that adds the escape sequences for italic.
xterm-256color-italic|xterm with 256 colors and italic,
Then install it by doing the following:
$ tic xterm-256color-italic.terminfo
Now you need to make sure that the terminfo is used by both your shell and
tmux. Make sure the following line is present in your
Depending on which shell you’re using.
.tmux.conf file add the following line:
set -g default-terminal "xterm-256color-italic"
Now you can check if it is set correctly by typing in the following command in
both the gnome-terminal and tmux.
$ echo $TERM
Now we should be able to get italics, and to check this, type the following in
both gnome-terminal and tmux. This should output the word italics.
echo `tput sitm`italics`tput ritm`
On to tmux. First we need to check if we have the correct version.
$ tmux -V
# it should be >= 2.2
If it isn’t the correct version, then remove tmux from you system and install
it. Get the latest
tar.gz file from the following page.
Extract the contents and install it. Instructions are also available on the
tmux github page.
# on ubuntu:
$ sudo apt-get install -y libevent-dev libncurses-dev build-essential
$ tar -xzvf tmux-2.2.tar.gz
$ cd tmux-2.2
$ ./configure && make
$ sudo make install
Now that we have the correct version we need to enable Tc terminal capability
for the outer terminal (to which tmux is attached) by setting the
terminal-overrides option in tmux.
First it will be reported as missing.
$ tmux info | grep Tc
And by adding the following line to your
.tmux.conf file (you might need
to restart your terminal):
set-option -ga terminal-overrides ",xterm-256color:Tc"
# When you're using the italic setup use the following line
set-option -ga terminal-overrides ",xterm-256color-italic:Tc"
The flag will be set to true:
$ tmux info | grep Tc
197: Tc: (flag) true
Now check the true-color capabilities of tmux by executing the script we used
with the gnome-terminal.
To enable true color capabilities for neovim add the following line to your
init.vim file (located at
Now you can choose a colorscheme that doesn’t force neovim to use 256 colors,
or one that doesn’t contain the line
When it doesn’t it will use the
guibg colors from the colorscheme.