Manipulate images with minimal use of memory via ImageMagick

Paperclip is intended as an easy file attachment library for ActiveRecord. The intent behind it was to keep setup as easy as possible and to treat files as much like other attributes as possible. This means they aren't saved to their final locations on disk, nor are they deleted if set to nil, until ActiveRecord::Base#save is called. It manages validations based on size and presence, if required. It can transform its assigned image into thumbnails if needed, and the prerequisites are as simple as installing ImageMagick (which, for most modern Unix-based systems, is as easy as installing the right packages). Attached files are saved to the filesystem and referenced in the browser by an easily understandable specification, which has sensible and useful defaults.

This pure Ruby library can read and write PNG images without depending on an external image library, like RMagick. It tries to be memory efficient and reasonably fast. It supports reading and writing all PNG variants that are defined in the specification, with one limitation: only 8-bit color depth is supported. It supports all transparency, interlacing and filtering options the PNG specifications allows. It can also read and write textual metadata from PNG files. Low-level read/write access to PNG chunks is also possible. This library supports simple drawing on the image canvas and simple operations like alpha composition and cropping. Finally, it can import from and export to RMagick for interoperability. Also, have a look at OilyPNG at https://github.com/wvanbergen/oily_png. OilyPNG is a drop in mixin module that implements some of the ChunkyPNG algorithms in C, which provides a massive speed boost to encoding and decoding.

Official AWS Ruby gem for EC2 Image Builder (imagebuilder). This gem is part of the AWS SDK for Ruby.

Handles all image upload and processing functionality in Refinery CMS.

High-level wrapper for processing images for the web with ImageMagick or libvips.

FastImage finds the size or type of an image given its uri by fetching as little as needed.

Sample data (including images) for use with Solidus.

ruby-vips is a binding for the libvips image processing library. It is fast and it can process large images without loading the whole image in memory.

This gem wraps the blueimp JavaScript Load Image library as a Rails asset gem. The library is by Sebastian Tschan, and the gem is packaged by Mike Virata-Stone.

Dependabot-Docker provides support for bumping Docker image tags via Dependabot. If you want support for multiple package managers, you probably want the meta-gem dependabot-omnibus.

When a Cucumber step fails, it is useful to create a screenshot image and HTML file of the current page

jQuery UI's JavaScript, CSS, and image files packaged for the Rails 3.1+ asset pipeline

xlsx spreadsheet generation with charts, images, automated column width, customizable styles and full schema validation. Axlsx helps you create beautiful Office Open XML Spreadsheet documents ( Excel, Google Spreadsheets, Numbers, LibreOffice) without having to understand the entire ECMA specification. Check out the README for some examples of how easy it is. Best of all, you can validate your xlsx file before serialization so you know for sure that anything generated is going to load on your client's machine.

SitemapGenerator is a framework-agnostic XML Sitemap generator written in Ruby with automatic Rails integration. It supports Video, News, Image, Mobile, PageMap and Alternate Links sitemap extensions and includes Rake tasks for managing your sitemaps, as well as many other great features.

Dragonfly is an on-the-fly Rack-based image handling framework. It is suitable for use with Rails, Sinatra and other web frameworks. Although it's mainly used for images, it can handle any content type.

lolcommits takes a snapshot with your webcam every time you git commit code, and archives a lolcat style image with it. It's selfies for software developers. `git blame` has never been so much fun.

xlsx spreadsheet generation with charts, images, automated column width, customizable styles and full schema validation. Axlsx helps you create beautiful Office Open XML Spreadsheet documents ( Excel, Google Spreadsheets, Numbers, LibreOffice) without having to understand the entire ECMA specification. Check out the README for some examples of how easy it is. Best of all, you can validate your xlsx file before serialization so you know for sure that anything generated is going to load on your client's machine.

xlsx spreadsheet generation with charts, images, automated column width, customizable styles and full schema validation. Axlsx helps you create beautiful Office Open XML Spreadsheet documents ( Excel, Google Spreadsheets, Numbers, LibreOffice) without having to understand the entire ECMA specification. Check out the README for some examples of how easy it is. Best of all, you can validate your xlsx file before serialization so you know for sure that anything generated is going to load on your client's machine.

Command line tool and ruby interface to optimize (lossless compress, optionally lossy) jpeg, png, gif and svg images using external utilities (advpng, gifsicle, jhead, jpeg-recompress, jpegoptim, jpegrescan, jpegtran, optipng, oxipng, pngcrush, pngout, pngquant, svgo)