Read/write access to PNG images in pure Ruby.
EXIF Reader
FastImage finds the size or type of an image given its uri by fetching as little as needed
Optimize images using multiple utilities
High-level image processing wrapper for libvips and ImageMagick/GraphicsMagick
Ruby wrapper around pHash, the perceptual hash library for detecting duplicate multimedia files
Parse Photoshop files in Ruby with ease
Ruby bindings for ImageMagick
Ruby library for working with the Tesseract OCR.
Ruby extension for the libvips image processing library.
Better ImageMagick for Ruby