image_threshold_test, an Octave code which calls image_threshold(), which creates a black and white version of a grayscale image by specifying a single threshold value; pixels below this value become black, and above this value they are white.
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image_threshold, an Octave code which makes a black and white version of a grayscale image by setting all pixels below or above a threshold value to black or white.
CONJUNCTION is an astronomical image.
STAR_FIELD is an astronomical image.