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The 12-bit rainbow palette
A palette of twelve colours chosen with consideration for how we perceive luminance, chroma, and hue
An LCH rainbow colour palette can be created by choosing fixed chroma and luminance values and varying the hue. However, the resulting palette looks unpleasant because yellow is darkened to brown, red is lightened to pink, and blue becomes very pale. The resulting palette has evenly-spaced hues, only small variations in chroma, and smoothly increasing and decreasing luminance:
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