Colormap Test Image

version 1.0 (44.3 KB) by Steve Eddins
Test image for evaluating perceptual effectiveness of a colormap for visualizing sequential data


Updated 20 Jul 2017

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The function colormapTestImage creates a grayscale image matrix that is useful for evaluating the effectiveness of colormaps for visualizing sequential data. The image has two sections. One is a linear ramp with a superimposed small-amplitude sinusoid. This section makes it easy to visually inspect a colormap for perceptual nonuniformities. The other section is a full-range linear ramp. The function can also display a colormap visualization.
The test image is inspired by and adapted from the test image proposed in Peter Kovesi, "Good Colour Maps: How to Design Them," CoRR, 2015.

Cite As

Steve Eddins (2022). Colormap Test Image (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2017a
Compatible with any release
Platform Compatibility
Windows macOS Linux
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