pastel
A command-line tool to generate, analyze, convert and manipulate color
pastel is a command-line tool to generate, analyze, convert and manipulate colors. It supports many different color formats and color spaces like RGB (sRGB), HSL, CIELAB, CIELCh as well as ANSI 8-bit and 24-bit representations. pastel provides a number of commands like saturate, mix or paint. To get more information about a specific subcommand (say mix), you can call pastel mix -h or pastel help mix. Many pastel commands can be composed by piping the output of one command to another. You can also explicitly specify which colors you want to read from the input.