Visualization: Reduce Number of Tones or Colors

How to aid visualization by reducing number of tones or colors through posterization.

How to Reduce Colors/Tones in GIMP

As in video, except that Posterize is found under Colors on menu.

How to Reduce Colors/Tones in Image J

Under Image > Look Up Tables and then select from list and hope for the best.

You may have to make color images into 8-bit color (Image > Type > 8-bit color) or into 8-bit grayscale (Image > Type > 8-bit) .

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