image processing framework
gmic is full-featured open-source framework for digital image processing, The framework provides several user interfaces to convert / process / visualize generic image datasets, ranging from 1D scalar signals to 3D+t sequences of multi-spectral volumetric images, hence including 2D color images. gmic itself is a command-line tool to use the image processing features from a shell. It may be seen as a "friendly" companion to the ImageMagick or GraphicsMagick software suites.
Homepage: https://gmic.eu/