Analyze an image for the 10 most common colors and their percentage.

image-analyze.rb

require 'RMagick'
include Magick

puts "Enter the path to the image you wish to analyze:"
file = gets.chomp

image = Magick::ImageList.new(file)

q = image.quantize(10, Magick::RGBColorspace)
palette = q.color_histogram.sort {|a, b| b[1] <=> a[1]}

total_depth = image.columns * image.rows
results = []

10.times do |i|
  unless palette[i].nil?
    p = palette[i]

    r = p[0].red / 257
    g = p[0].green / 257
    b = p[0].blue / 257

    rgb = "#{r},#{g},#{b}"
    hex = r.to_s(16) + g.to_s(16) + b.to_s(16)
    depth = p[1]

    results << {
      rgb: rgb,
      hex: hex,
      depth: depth
    }
  end
end

print "\n\nImage Color Analysis for: #{file}"
print "\n-------------------------------"
results.each do |r|
  print "\nRGB Value:   #{r[:rgb]}"
  print "\nHex Value:   ##{r[:hex]}"
  print "\nPercentage:  " + ((r[:depth].to_f / total_depth.to_f) * 100).round(2).to_s
  print "\n-------------------------------"
end
print "\n\n"