go-colorful is a Go library (no binaries of its own) for working with
colors: converting between color spaces (RGB, HSV, HSL, Lab, Luv, HCL,
XYZ, and more), measuring perceptual color distance, blending/
interpolating colors, and generating palettes of distinct or
aesthetically pleasing colors.

License: MIT (see /usr/doc/go-colorful-<version>/LICENSE).