Theseus is a library for building random mazes.

Dynamic image generation for Compass using ChunkyPNG/PhantomJS.

Gem for placing and getting evercookie for rails application

Image comparison lib built on top of ChunkyPNG

QR code decoder in pure Ruby

Extend functionality for spree to give shop like ordering ability through admin end

A simple github-like identicons generator.

A set of bindings between Ruby and Mapnik. Supports many of the common uses for Mapnik, and one day, might support all of them. Rendering is available using the standard AGG library, or additionally via Cairo, if the rcairo gem is installed and Mapnik has been compiled with Cairo support.

A library which implements the client VNC protocol to control VNC servers.

Minify SVG assets, and optionally convert them to PNG for browser compatibility.

CSS-Spriter is a pure ruby PNG spriting library. It can be used standalone or as a Rails plugin, see the readme for details.

A ruby implementation of ESC/POS (thermal) printer image command specification.

pixelart - yes, you can! generate your own pixel art images (off-blockchain) using any design (in ascii text) in any colors; incl. 2x/4x/8x zoom for bigger sizes

rQRCode is a library for encoding QR Codes. The simple interface allows you to create QR Code data structures ready to be displayed in the way you choose.

Ruby interface to the Tableau API.

Generates transparent PNG and Data URI bumpspark-style sparklines. Use from Ruby directly or as a Rails helper.

Library used to deal with colors and images

Compare screenshots in your tests!

Nice class method wrapper for Barby

lineup takes to screenshots of your app and compares them to references in order to find design flaws in your new code.