API for 'true 24-bit colors' is added here. @julianduque I wanted to get our opinion on the API before pushing.

The addition is color:true/2 (and color:on_true/2) which can be used like so, to print black:

color:true("FFFFFF", "...")
...
color:true([255,255,255], "...")

Do you think true is OK for the function name? color:hex/2 is another option which comes to mind. I decided to go with true mainly because the wikipedia article refers to 24-bit color as 'true'.

Thanks!

I've added support for RGB colors (xterm256 colors) here.
However, I'm not sure I've chosen the proper API color:rgb([R, G, B], "text"), and color:on_rgb([R, G, B], "text") for background. Example:

io:format("Hello, this is the ~s color~n", [ color:rgb([3,0,0], "red") ]).

Would you be interested in merging this?
Do you think the API can be improved?

Would you be interested in adding support for background colors? I have a working version in https://github.com/edkolev/erlang-color

As I haven't designed any Erlang APIs, I'm not sure if the chosen functions names color:on_X (where X is red/black/..) are appropriate.

Here's a screenshot showing how the new functions can be used:

Would you be interested in merging this?