github.com/disIntegration/imaging (go): Package imaging provides basic image processing functions (resize, rotate, crop, brightness/contrast adjustments, etc.).  All the image processing functions provided by the package accept any image type that implements image.Image interface as an input, and return a new image of *image.NRGBA type (32bit RGBA colors, not premultiplied by alpha).
Keywords: blur|brightness|contrast|convolution|crop|gamma|image|resize|rotate|sharpness