pastel
Generate, analyze, convert and manipulate colors.
TLDR
Convert colors from one format to another. Here from RGB to HSL
$ pastel format [hsl] [ff8000]
Show and analyze colors on the terminal
$ pastel color "[rgb(255,50,127)]"
Pick a color from somewhere on the screen
$ pastel pick
Generate a set of N visually distinct colors
$ pastel distinct [8]
Get a list of all X11 / CSS color names
$ pastel list