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Articles on color grading, color science and skin tones in Photoshop.

The a*–b* plane of Lab space with an example skin tone

Skin tone: why b > a is not a strict rule

CIE data on 11,235 skin measurements: 42.5% of Caucasian face readings have a* > b*. Why b* > a* is a tendency, not a law, when you correct skin tones.