OSS Imaging Libraries

List of all open-source imaging libraries and their strengths and weaknesses. Please help me improve this page! Submit pull requests for additions and corrections.

We're looking for a cross-platform library suitable for on-demand, server-side image processing. It should have the following attributes:

Free-threaded (No shared graphics thread)
Multi-tenanting-enabled (Multiple instances per process)
Fast hq image decoding, encoding, and scaling
At least accurate bicubic scaling must be implemented. Bicubic smoother & lanczos preferred.
No memory leaks whatsoever
Low RAM use
Fast startup times
Fast per-image processing times
Secure
Permissive license

Library	License	Language	Promising?	Comments
LibGD	Similar to MIT	C	yes	See LibGD.md
Skia image_operations.cc	New BSD	C++	Yes
Libvips	LGPL	C++	yes
Cairo	LGPL 2.1 or MPL 1.1	C	Yes
OpenCV	BSD	C++
OpenCV-Ruby	BSD
OpenImageIO Github	BSD	C++	Yes - very active
Pixman	MIT	C	Yes
CImg	CeCILL-C
CxImage	zlib	C++
Leptonica	Apache	C	Yes
DevIL	LGPL
PIL or Pillow	Similar to MIT/BSD	C		Tied to Python. Pillow is a community fork.
Magick++ as a part of ImageMagick	Apache	C++
FreeImage	GPL 2/3 OR FIPL	C
SDL_Image	zlib license
Adobe Generic Image Library	Boost Software License	C++	No	Entirely C++ templates; part of Boost; no actual imaging algorithms.
ExactImage	GPL 2
ImLib2	Unclear
Marvin	LGPL	Java
Animal	GPL	C
Gandalf	LGPL	C
IM	MIT	C++
PIL	BSD-style	C/Python
GMIC	CeCILL2	C
FrameWave	Apache V2.0	C		AMD's alternative to IPP. Claims to also work decently on Intel
modpagespeed kernel/image	Apache 2	C++	Offers box/area averaging resizing, Google's page optimization apache module

Uncategorized - need to organize

mosra/magnum http://gfxprim.ucw.cz/

mono/csharpplugin <- Create .NET wrappers from header files (better than SWIG)

List of imaging libraries with lisp bindings

http://stackoverflow.com/questions/11816571/light-weight-c-image-library

http://www.tecgraf.puc-rio.br/im/

http://www.exactcode.com/site/open_source/exactimage/releases/ GPL

https://github.com/cinder/Cinder/blob/ae580c2cb0fc44d0a99b233dbefdf736f7093209/src/cinder/ip/Resize.cpp Cinder Modified BSD

Optimization resources

rflynn/imgmin

Halide, a language for optimized image processing - Very promising!

liborc

ispc/ispc

.NET

praeclarum/CrossGraphics

Graphics Gems

erich666/GraphicsGems https://github.com/erich666/GraphicsGems/blob/master/gemsiii/filter.c https://github.com/erich666/GraphicsGems/blob/master/gemsiii/bitmap.c

Image servers

buaazp/zimg ImageMagick-based, async kristopolous/apophnia ImageMagick-based

beetlebugorg/mod_dims ImageMagick-based

3078825/ngx_image_thumb LibGD based

hudora/huImages PIL based

lovell/sharp libvips based for Node

ipconfiger/pyImageServer

sdepold/node-imageable-server

agschwender/pilbox

Scaling-only resources

https://code.google.com/p/imageresampler/

github/jrmuizel/image-scaling: Porting Skia scaling to Emscripten

https://code.google.com/p/java-image-scaling/

tmiddelkoop/ImageResize

jrmuizel/pixman-scaler

Imaging/graphics libraries that don't offer significant image scaling abilities

Library	License	Platforms	Language
ccv	MIT	C++
GDAL	MIT	?

Exisitng comparisons

http://www.vips.ecs.soton.ac.uk/index.php?title=Speed_and_Memory_Use http://randomfoo.net/2013/02/24/performance-comparison-of-image-libraries-revisited http://leocharre.com/articles/faster-image-resizing-in-linux/

Chainable image processing frameworks with GUIs

MathMap - schani/mathmap

Vips - http://www.vips.ecs.soton.ac.uk/index.php?title=Libvips

https://code.google.com/p/imagestack/

iOS specific

BradLarson/GPUImage

Go-lang

disintegration/imaging

Windows APIs

Windows Imaging Components StrechDIBits DrawDIB

Image resizing and transformation reading

Unsorted

psobot/smartcrop

Finding more libraries on GitHub

https://github.com/search?l=C%23&p=2&q=stars%3A%3E1+graphics&ref=searchresults&type=Repositories

Imaging Wiki