image_contrast_test, an Octave code which calls image_contrast(), which carries out a simple contrast enhancement operation on an image.
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image_contrast, an Octave code which applies image processing techniques to increase the contrast in an image.
SURFSUP is a grayscale image.
UNDERWATER_BMX is an RGB image. Note that attempts to increase the blurriness of this image using a value of S less than 1 didn't seem to have much effect.