SBPaletteSequentialHCL#

This class is a base class for sequential HCL color palettes.

A sequential palette is constructed in a 3D color coordinate space with coordinates named hue, chroma, and luminance, that are computed as follows:

hue = hue1 + i * (hue2 - hue1)
if Cmax < chroma1 or maximumChroma < chroma2 then chroma is computed based on a “linear” trajectory c = chroma1 + i^(chromaPower) * (chroma2 - chroma1) (see samson.SBPalette.getValueAlongLinearTrajectory), else it is computed based on the triangular trajectory (see samson.SBPalette.getValueAlongTriangularTrajectory)
luminance = luminance1 + i^(luminancePower) * (luminance2 - luminance1)

Here i is a value (of intensity) based on which the colorization should be done.

Examples of sequential HCL palettes#

# Single-hue sequential HCL palette - Green
palette1 = SBPaletteSequentialHCL(
  hue1 = 135, hue2 = 135,
  chroma1 = 45, maximumChroma = 0, chroma2 = 45,
  luminance1 = 35, luminance2 = 95,
  chromaPower = 1.0,
  luminancePower = 1.3,
  name = "Sequential: Green")

# Multi-hue sequential HCL palette - Viridis
palette2 = SBPaletteSequentialHCL(
  hue1 = 300, hue2 = 75,
  chroma1 = 40, maximumChroma = 0, chroma2 = 95,
  luminance1 = 15, luminance2 = 90,
  chromaPower = 1.0,
  luminancePower = 1.1,
  name = "Sequential: Viridis")

# Multi-hue sequential HCL palette - Teal
palette3 = SBPaletteSequentialHCL(
  hue1 = 240, hue2 = 180,
  chroma1 = 35, maximumChroma = 40, chroma2 = 15,
  luminance1 = 35, luminance2 = 92,
  chromaPower = 0.6,
  luminancePower = 1.1,
  name = "Sequential: Teal")

SBPaletteSequentialHCL

Contents

SBPaletteSequentialHCL#