Colormap Perception Lab

The same dataset can look wildly different depending on which colormap draws it. This simulator renders a real 3D terrain — a mix of Gaussian bumps and smooth noise you control — and colors it by height using Viridis, Jet or a plain grayscale ramp, converting every color to CIE L*a*b* to measure how perceptually uniform that ramp actually is. A vision-simulation mode reapplies a colorblindness transform matrix to the whole scene so you can see, and measure, how much of the encoded signal a deuteranope or protanope loses when the colormap depends on red/green contrast instead of lightness.