Numeric palettes

Numeric palettes map numeric values to colors and are defined as:

• An array of color stops that each have a numeric value, and two colors:
  • one that is applied before this value (the “first” color);
  • one that is applied after this value (the “second” color).
• A NaN color, applied when the value is NaN (not a number).

For each value that needs to be palettized, the second color of the stop below it and the first color of the stop above it are retrieved, then they are interpolated according to the selected mode.

Interpolation modes

There are multiple interpolation modes available that have different characteristics.

• We recommend using OkLab since it gives the nicest, most visually intuitive results.
• sRGB is implemented because many other software components only know about this mode since it’s the easiest to implement without knowledge of color spaces.