How to: Image Processing
* [FastImage](https://github.com/sdsykes/fastimage) - FastImage finds the size or type of an image given its uri by fetching as little as needed.
* [ImageProcessing](https://github.com/janko/image_processing) - High-level image processing wrapper for libvips and ImageMagick/GraphicsMagick
* [MiniMagick](https://github.com/minimagick/minimagick) - A ruby wrapper for ImageMagick or GraphicsMagick command line.
* [Phasion](https://github.com/westonplatter/phashion) - Ruby wrapper around pHash, the perceptual hash library for detecting duplicate multimedia files.
* [PSD.rb](https://github.com/layervault/psd.rb) - Parse Photoshop files in Ruby with ease.
* [RMagick](https://github.com/rmagick/rmagick) - RMagick is an interface between Ruby and ImageMagick.
* [ruby-vips](https://github.com/jcupitt/ruby-vips) - A binding for the libvips image processing library.
* [Skeptick](https://github.com/maxim/skeptick) - Skeptick is an all-purpose DSL for building and running ImageMagick commands.