GD Graphics Library, famously used in PHP for image loading/manipulation & thumbnail generation. [custom permissive license, requires mention in user docs] website

GD alternatives and similar libraries

Based on the "Image Processing" category

• OpenCV

  10.0 9.7 L1 GD VS OpenCV

  Open source computer vision. [BSD]

• tesseract-ocr

  9.9 8.9 L1 GD VS tesseract-ocr

  An OCR engine. [Apache2]

• OpenMVG (open Multiple View Geometry)

  8.4 7.6 GD VS OpenMVG (open Multiple View Geometry)

  Promoting 3d reconstruction from images through multiple-view geometry algorithms and ready to use pipelines.

• VTK

  7.5 9.9 L1 GD VS VTK

  Open-source, freely available software system for 3D computer graphics, image processing and visualization. [BSD]

• OpenImageIO

  6.9 9.2 L1 GD VS OpenImageIO

  Powerful image and texture wrangling library with support for a wide number of common lossy and RAW formats. [Modified BSD]

• OpenEXR

  6.7 9.2 L1 GD VS OpenEXR

  Cross-platform library for high dynamic range imaging. [Modified BSDF]

• ITK

  6.3 9.6 L2 GD VS ITK

  An open-source, cross-platform system for image analysis. [Apache2 from ITK 4.0]

• Magick++

  6.2 5.2 GD VS Magick++

  ImageMagick program interfaces for C++. [Apache2]

• CImg

  5.7 9.3 GD VS CImg

  A small, open source, C++ toolkit for image processing. [Own LGPL or GPL]

• Video++

  5.2 0.0 L2 GD VS Video++

  A C++14 high performance video and image processing library. [MIT]

• VIGRA

  4.7 3.2 L1 GD VS VIGRA

  A generic C++ computer vision library for image analysis. [MIT X11]

• libvips

  4.4 5.0 L3 GD VS libvips

  A fast image processing library with low memory needs. [LGPL] website

• hiptext

  4.2 0.0 L3 GD VS hiptext

  Turn images into text better than caca/aalib

• SVG++

  4.1 1.7 L3 GD VS SVG++

  The most advanced SVG reading library for C++

• GDCM

  3.9 8.7 L1 GD VS GDCM

  Grassroots DICOM library.

• Boost.GIL

  3.3 8.6 L3 GD VS Boost.GIL

  Generic Image Library.

• CxImage

  3.2 0.0 L1 GD VS CxImage

  An image processing and conversion library to load, save, display, transform BMP, JPEG, GIF, PNG, TIFF, MNG, ICO, PCX, TGA, WMF, WBMP, JBG, J2K images. [zlib]

• FreeImage

  2.3 0.0 L2 GD VS FreeImage

  An open source library that supports popular graphics image formats and others as needed by today's multimedia applications. [GPL2 or GPL3]

• Lingo

  1.5 8.7 GD VS Lingo

  Text encoding for modern C++

• DCMTK

  - - GD VS DCMTK

  DICOM Toolkit.

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• GD
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