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ImageMagick is a free, open-source software suite for creating, editing, converting, and displaying images. It supports 200+ formats and offers powerful command-line tools and APIs for automation, scripting, and integration across platforms.
A very compact representation of a placeholder for an image.
TranslatedLuban 2（鲁班 2） —— An efficient and concise Android image compression library that closely replicates the compression strategy of WeChat Moments.
A fast image processing library with low memory needs.
The “Quite OK Image Format” for fast, lossless image compression
Improved JPEG encoder.
Light Weight Image Processor for NodeJS
Leptonica is an open source library containing software that is broadly useful for image processing and image analysis applications. The official github repository for Leptonica is: danbloomberg/leptonica. See leptonica.org for more documentation.
jpegoptim - utility to optimize/compress JPEG files
Super fast C++ .PNG writer/reader
GD Graphics Library
⛵The missing fast imaging library for humans (not for machines).
A single-header, zero-allocation image filter library in C
Rawstudio is an open-source program to read and manipulate RAW images from digital cameras.
A fast image processing library with low memory needs.
Actionscript 3.0 library for FFT, SURF, edge detection, fluid solver, etc