Softpress has introduced Chroma for Mac (https://www.softpress.com/chroma/). The $10 (for a limited time) app generates “well-balanced and complementary color palettes” from images.
Designed exclusively for OS X Yosemite and El Capitan, it emulates the way the human eye perceives color to create natural looking palettes. Individual colors from palettes can be copied or dragged in various formats, or entire palettes can be exported and integrated with most major design applications and the built-in system color picker.
