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https://www.gnu.org/software/ncurses/ncurses.html
Announcing ncurses 6.1 Overview. The ncurses (new curses) library is a free software emulation of curses in System V Release 4.0 (SVr4), and more. It uses terminfo format, supports pads and color and multiple highlights and forms characters and function-key mapping, and has all the other SVr4-curses enhancements over BSD curses.
http://www.tldp.org/HOWTO/NCURSES-Programming-HOWTO/color.html
After that, you can use color capabilities of your terminals using various functions. To find out whether a terminal has color capabilities or not, you can use has_colors() function, which returns FALSE if the terminal does not support color. Curses initializes all the colors supported by terminal when start_color() is called.
https://gist.github.com/XVilka/8346728
Oct 28, 2019 · The 256-color palette is configured at start and is a 666-cube of colors, each of them defined as a 24-bit (888 rgb) color. This means that current support can only display 256 different colors in the terminal while "true color" means that you can display 16 million different colors at the same time.
https://fedoraproject.org/wiki/Features/256_Color_Terminals
256 Color Terminals Summary. Enable terminal programs to use the enhanced color capabilities of modern terminals by default. I.E. increase their color options from the 8 colors at the top of this picture, to the other 256 displayed.
https://github.com/weechat/weechat/issues/1343
According to ncurses documentation the support for more than 256 color pairs only exists in ncurses ABI 6 and not ABI 5, which still seems to be used with ncurses 6.1 on Ubuntu etc. Nevertheless, fixing this issue should be possible and would benefit users …
https://gitlab.com/buildroot.org/buildroot/commit/09dd9d1755ee321514ad1e47fe3b70aa63201395
Dec 19, 2017 · ncurses: install 256 color terminfo files unconditionally There are three 256 color terminfo files that buildroot only installs if ncurses is configured with wide character support, which also enables ext-color. There is a fourth 256 color terminfo file that does not depend on wchar suport and is always installed.
https://lists.gnu.org/archive/html/bug-ncurses/2014-01/msg00008.html
Jan 24, 2014 · Truecolor support in ncurses, Антон Кочков <= Re: Truecolor support in ncurses, Thomas Dickey, 2014/01/23. Re: Truecolor support in ncurses, Egmont Koblinger, 2014/01/23. Re: Truecolor support in ncurses, Egmont Koblinger, 2014/01/27; Re: Truecolor support in ncurses, Thomas Dickey, 2014/01/27
https://unix.stackexchange.com/questions/1045/getting-256-colors-to-work-in-tmux
I have 256 colors working just fine in konsole,.I thought I'd give tmux a try because, unlike screen, it seems to support vi mode. However I find that the colors of my prompt show up and this is most likely because I have a 256 color mode prompt.
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