TwelveMonkeys ImageIO is a collection of plugins and extensions for Java's ImageIO. These plugins extends the number of image file formats supported in Java, using the javax.imageio.* package. The main purpose of this project is to provide support for formats not covered by the JRE itself.

TwelveMonkeys ImageIO: Additional plug-ins and extensions for Java's ImageIO

Small Go package for fast high-level image processing using libvips via C bindings, providing a simple programmatic API. bimg is able to output images as JPEG, PNG and WEBP formats, including transparent conversion across them.

bimg - Small Go package for fast high-level image processing powered by libvips C library

Cairo is a 2D Vector graphics library with support for multiple output devices. Currently supported output targets include the X Window System, Quartz, Win32, image buffers, PostScript, PDF, and SVG file output. Experimental backends include OpenGL (through glitz), XCB, BeOS, OS/2, and DirectFB. <BR><BR>Cairo is designed to produce consistent output on all output media while taking advantage of display hardware acceleration when available (eg. through the X Render Extension).<BR><BR>The cairo API provides operations similar to the drawing operators of PostScript and PDF. Operations in cairo including stroking and filling cubic Bézier splines, transforming and compositing translucent images, and antialiased text rendering. All drawing operations can be transformed by any affine transformation (scale, rotation, shear, etc.)

Cairo is a 2D graphics library with support for multiple output devices. Currently supported output targets include the X Window System, Quartz, Win32, image buffers, PostScript, PDF, and SVG file output. Experimental backends include OpenGL (through glitz), XCB, BeOS, OS/2, and DirectFB.

Cairo Graphics

Tesseract is a C++ open source OCR engine. Tessnet2 is .NET assembly that expose very simple methods to do OCR.
Tessnet2 is multi threaded. It uses the engine the same way Tesseract.exe does. Tessdll uses another method (no thresholding).

A .NET 2.0 Open Source OCR assembly using Tesseract engine.

Tessnet2

Gwenview is an image viewer for KDE. Gwenview can load and save all image formats supported by KDE. It can accurately control the way images are scaled. It supports image manipulations like rotation, mirroring, cropping, resizing and red eye reduction. When browsing JPEG images with EXIF information, Gwenview automatically rotates them according to the EXIF Orientation tag. 

Gwenview - Image Viewer for KDE

Libface is a cross platform framework for developing face recognition algorithms and testing its performance. The library uses OpenCV 2.0 and aims to be a middleware for developers that don’t have to include any OpenCV code in order to use face recognition and face detection detection.

libface - Face Recognition Library

Image resizing, cropping and compression on the fly with the impressive MozJPEG compression algorithm. One Docker container to build your own Cloudinary-like service.You pass the image URL and a set of keys with options, like size or compression. Flyimg will fetch the image, convert it, store it, cache it and serve it. The next time the request comes, it will serve the cached version.

Flyimg - Microservice to resize and crop images on the fly

JMagick is an open source Java interface of ImageMagick. It is implemented in the form of a thin Java Native Interface (JNI) layer into the ImageMagick API.

JMagick - Java interface of ImageMagick

Thumbnailator is a thumbnail generation library for Java. Learning how to use the Image I/O API, Java 2D API, image processing, image scaling techniques etc is fairly difficult task. Thumbnailator will take care of all those things for you. Thumbnailator is a single JAR file with no dependencies to external libraries, making development and deployment simple and easy. It also provides support to watermark, rotate, fluent API.

Thumbnailator - A thumbnail generation library for Java

An example of using OpenCV library in server environment using Node.js.  Here you will see that it's really simple to perform CPU-intense image processing routines in the cloud. A Node.js server handle client requests and calls C++ back-end.

CloudCV - Large-Scale Distributed Computer Vision As A Cloud Service

imgscalr is a Java Image-Scaling Library implementing Chris Campbell's incremental scaling algorithm as well as Java2D's "best-practices" image-scaling techniques. 
imgscalr also provides support for applying arbitrary BufferedImageOps against resultant images directly in the library. It can fit an image to a specific width or height regardless of its orientation using a Mode argument.

imgscalr - Java Image-Scaling Library

This project adds read/write support for the file types wbmp, bmp, pcx. pnm. raw, tiff, gif to Java's ImageIO. The classes of this projects are not generally used directly, but through the SPI plugin mechanism of ImageIO.

JAI - JAI ImageIO Core (without javax.media.jai dependencies)

  Batik is a Java based toolkit for applications which handle
  images in the Scalable Vector Graphics (SVG) format for
  various purposes, such as viewing, generation or
  manipulation. The project's ambition is to give developers a set of core modules which can be used together or individually to support specific SVG solutions. Examples of modules are an SVG parser, an SVG generator and an SVG DOM implementation.

Apache Batik - The Apache Foundation’s Java-based toolkit for SVG generation and manipulation

im4java is a pure-java interface to the ImageMagick commandline.  im4java just generates the commandline for the ImageMagick commands and passes the generated line to the selected IM-command (using the java.lang.ProcessBuilder.start()-method). 

im4java - java interface to the ImageMagick commandline

Tuttle OFX is a library to connect and batch operations with OpenFx plugins. It comes with a set of plugins that allows you to batch process on movies and file sequences.

TuttleOFX - Image Processing Framework based on OpenFX plugin

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