Heatmap Color Palette

Heatmap Color Palette treats color as an address in an ordered dataset. Index Zero begins in dark blue, then Low Signal, Lower Mid, and Upper Mid advance steadily toward High Signal and Peak Value without inventing a dramatic boundary in the middle.

The six HEX values are evenly spaced samples from cividis, a colormap optimized for perceptual uniformity and more consistent interpretation across typical vision and red-green color vision deficiency.

Increasing lightness keeps the rank legible even when hue differences are less apparent.

Use this sequential scale for counts, density, duration, probability, or another metric that moves in one direction.

If zero or a target value is the semantic center, switch to a diverging palette; if colors name unrelated categories, use a qualitative set instead.