The typical use case for this high speed Node.js module is to convert large images in common formats to smaller, web-friendly JPEG, PNG and WebP images of varying dimensions.Resizing an image is typically 4x-5x faster than using the quickest ImageMagick and GraphicsMagick settings.

Sharp - High performance Node.js image processing

ImageSharp is a new, fully featured, fully managed, cross-platform, 2D graphics API. Without the use of System.Drawing we have been able to develop something much more flexible, easier to code against, and much, much less prone to memory leaks. Gone are system-wide process-locks; ImageSharp images are thread-safe and fully supported in web environments. Built against .Net Standard 1.1 ImageSharp can be used in device, cloud, and embedded/IoT scenarios.

ImageSharp - A cross-platform library for the processing of image files; written in C#

JavaCV uses wrappers from the JavaCPP Presets of commonly used libraries by researchers in the field of computer vision (OpenCV, FFmpeg, libdc1394, PGR FlyCapture, OpenKinect, librealsense, CL PS3 Eye Driver, videoInput, ARToolKitPlus, and flandmark), and provides utility classes to make their functionality easier to use on the Java platform, including Android.

javacv - Java interface to OpenCV, FFmpeg, and more

Scrimage is a consistent, idiomatic, and immutable scala library for manipulating and processing of images. The aim of the this library is to provide a quick and easy way to do the kinds of image operations that are most common, such as scaling, rotating, converting between formats and applying filters. It is not intended to provide functionality that might be required by a more "serious" image processing application - such as face recognition or movement tracking.
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A typical use case for this library would be creating thumbnails of images uploaded by users in a web app, or resizing a set of images to have a consistent size, or optimizing PNG uploads by users to apply maximum compression, or applying a grayscale filter in a print application.

Scrimage is a consistent, idiomatic, and immutable scala library for manipulating and processing of images. The aim of the this library is to provide a quick and easy way to do the kinds of image operations that are most common, such as scaling, rotating, converting between formats and applying filters. It is not intended to provide functionality that might be required by a more "serious" image processing application - such as face recognition or movement tracking.

Scrimage - Scala image processing library

Squoosh will be an image compression web app that allows you to dive into the advanced options provided by various image compressors.

Squoosh - Make images smaller using best-in-class codecs, right in the browser

Leptonica Library supports many operations that are useful on Document images, Natural images. It supports fundamental image processing operations like scaling, translation, rotation, shear, Binary and grayscale morphology, blending and lot more.


Leptonica - An open source C library for efficient image processing and image analysis operations

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

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

  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

Pixels.JS is an image filtering library with over 70 photo filters for use in the browser or with Node.JS. Image filtering comprises vintage filters, solarizers, inverters, and over ninety more. You can explore these in the Flashback web app, which makes use of the library.

Pixels.JS - An image filtering library, containing over 70 image filters for use in-browser and with Node

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