24-bit color support (\033[38;2;rrr;ggg;bbbm) has been mainline in both Konsole and in libvte-based terminal emulators for many years. 16777216 colors. That's still not every color, but it's every color your monitor can display. When I wrote http://canonical.org/~kragen/sw/dev3/gradient.c in 02016 I had it in Konsole but not libvte, though I think it had been added to libvte upstream. http://canonical.org/~kragen/sw/dev3/gradient.png

Color in terminal emulators was one of the main perks of Linux over other Unixes for me at first!

256 colors ought to be enough for anybody.

Laughs in Amiga