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Same as "Make Binary" in NIH Image. Makes a binary (0 - 1) or mask image using threshold levels set with the threshold slider. The red pixels (colored by the slider) are 1 (or white), and the others are 0 (or black) in the binary image.
Not used very much with MacLispix except for image processing research. (The binary Mathematical Morphological operations such as Erode, Dilate, Open, Close and Skeletonize found in NIH Image are not yet available in MacLispix. 6/97 DSB)
This function is done automatically and transparently by the Blob Widget.