/usr/ is in ruby-color-tools 1.4.1-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/color/
/usr/lib/ruby/vendor_ruby/color/rgb/
/usr/lib/ruby/vendor_ruby/color/rgb/metallic.rb
/usr/lib/ruby/vendor_ruby/color/cmyk.rb
/usr/lib/ruby/vendor_ruby/color/css.rb
/usr/lib/ruby/vendor_ruby/color/hsl.rb
/usr/lib/ruby/vendor_ruby/color/palette.rb
/usr/lib/ruby/vendor_ruby/color/rgb.rb
/usr/lib/ruby/vendor_ruby/color/grayscale.rb
/usr/lib/ruby/vendor_ruby/color/yiq.rb
/usr/lib/ruby/vendor_ruby/color/palette/
/usr/lib/ruby/vendor_ruby/color/palette/monocontrast.rb
/usr/lib/ruby/vendor_ruby/color/palette/gimp.rb
/usr/lib/ruby/vendor_ruby/color/palette/adobecolor.rb
/usr/lib/ruby/vendor_ruby/color/rgb-colors.rb
/usr/lib/ruby/vendor_ruby/color.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-color-tools/
/usr/share/doc/ruby-color-tools/README.txt
/usr/share/doc/ruby-color-tools/copyright
/usr/share/doc/ruby-color-tools/changelog.Debian.gz