convert blue favorite stars to orange favorite stars with imagemagick

gistfile1.rb

FILES = %w(
drawable-hdpi/btn_star_off_disabled_focused_holo_dark.png
drawable-hdpi/btn_star_off_disabled_holo_dark.png
drawable-hdpi/btn_star_off_focused_holo_dark.png
drawable-hdpi/btn_star_off_normal_holo_dark.png
drawable-hdpi/btn_star_off_pressed_holo_dark.png
drawable-hdpi/btn_star_on_disabled_focused_holo_dark.png
drawable-hdpi/btn_star_on_disabled_holo_dark.png
drawable-hdpi/btn_star_on_focused_holo_dark.png
drawable-hdpi/btn_star_on_normal_holo_dark.png
drawable-hdpi/btn_star_on_pressed_holo_dark.png
drawable-mdpi/btn_star_off_disabled_focused_holo_dark.png
drawable-mdpi/btn_star_off_disabled_holo_dark.png
drawable-mdpi/btn_star_off_focused_holo_dark.png
drawable-mdpi/btn_star_off_normal_holo_dark.png
drawable-mdpi/btn_star_off_pressed_holo_dark.png
drawable-mdpi/btn_star_on_disabled_focused_holo_dark.png
drawable-mdpi/btn_star_on_disabled_holo_dark.png
drawable-mdpi/btn_star_on_focused_holo_dark.png
drawable-mdpi/btn_star_on_normal_holo_dark.png
drawable-mdpi/btn_star_on_pressed_holo_dark.png
drawable-xhdpi/btn_star_off_disabled_focused_holo_dark.png
drawable-xhdpi/btn_star_off_disabled_holo_dark.png
drawable-xhdpi/btn_star_off_focused_holo_dark.png
drawable-xhdpi/btn_star_off_normal_holo_dark.png
drawable-xhdpi/btn_star_off_pressed_holo_dark.png
drawable-xhdpi/btn_star_on_disabled_focused_holo_dark.png
drawable-xhdpi/btn_star_on_disabled_holo_dark.png
drawable-xhdpi/btn_star_on_focused_holo_dark.png
drawable-xhdpi/btn_star_on_normal_holo_dark.png
drawable-xhdpi/btn_star_on_pressed_holo_dark.png
)

Dir.chdir("/tmp")
FILES.each do |src|
  src, dst = "stars/#{src}", "output/#{src}"
  Util.mkdir_if_necessary(File.dirname(dst))
  Util.run "convert #{src} -fx 'r+g-1*b' +level-colors '#ffcc00',white #{dst}"
end