1. colorpatch::GreenRedRGB
    Standard RGB Green/Red two-sided color scale.
    rda| rds
    sRGB
  2. colorpatch::OptimBlueYellowLAB
    Optimum RGB Blue/Yellow two-sided color scale in LAB color space.
    rda| rds
    sRGB
  3. colorpatch::OptimGreenRedLAB
    Optimum RGB Green/Red two-sided color scale in LAB color space.
    rda| rds
    sRGB