A pure ruby image identification library.

gem install identify

BMP, PNG, JPG, GIF, XPM, PPM, PGM, PNM, PBM, XBM, TIFF

require 'identify'

p Identify.image File.binread("test/images/test.png", 1024)

{:width=>253, :height=>178, :format=>"png"}

Tests require a local installation of ImageMagick and identify to be in your $PATH

Channel type, Depth, Colorspace and Resolution.

http://rubygems.org/gems/imagesize

MIT