Color Diff

Calculating differences between colors using the CIEDE2000 algorithm

Install

gem install color_diff

Usage

Difference between two colors:

yellow = ColorDiff::Color::RGB.new 255, 255, 0
gold   = ColorDiff::Color::RGB.new 255, 215, 0

ColorDiff.between yellow, gold
# => 11.584521223499245

Picking the most similar color from a list:

red    = ColorDiff::Color::RGB.new 255,   0,   0
blue   = ColorDiff::Color::RGB.new   0,   0, 255
yellow = ColorDiff::Color::RGB.new 255, 255,   0
gold   = ColorDiff::Color::RGB.new 255, 215,   0

list   = ColorDiff::List.new [red, blue, yellow]
list.closest_to(gold) == yellow
# => true

Building a map of nearest match colors from a finite palette:

red       = ColorDiff::Color::RGB.new 255,  0,  0
black     = ColorDiff::Color::RGB.new   0,  0,  0
dark_gray = ColorDiff::Color::RGB.new  80, 80, 80
maroon    = ColorDiff::Color::RGB.new 128,  0,  0

list = ColorDiff::List.new [red, black]
palette = [dark_gray, maroon]

list.closest_to_map(palette)
# => { 'R255G0B0' => maroon, 'R0B0G0' => dark_gray }