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Glasbey

glasbey

The Glasbey lookup table (LUT) is a color table structured in a maximally discontinuous manner. That is, adjacent color bins are chosen to be as distinct from one another as possible.

Like other LUTs, it is available from the ImageLookup Tables menu.

The LUT called “glasbey” uses white at the first index, whereas “glasbey inverted” starts with black.

Labelings

The Glasbey LUT has numerous uses. It can be helpful when coloring a “labeling” of integer-coded regions, since each region will then appear obviously distinct:

glasbey-labeling

JPEG artifacts

Glasbey can also be used to illustrate otherwise-subtle phenomena such as JPEG compression artifacts. Here is a comparison of the Boats sample image before and after being resaved as a JPEG:

jpeg-grayscale

The grayscale LUT makes it very difficult (for most people) to see any visual difference.

jpeg-glasbey

The Glasbey LUT makes it quite obvious where JPEG compression caused a loss of data fidelity.

Publication

The Glasbey LUT is based on the publication:

doi:10.1002/col.20327