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• Photoshop's RGB to HSB calculation

# Photoshop's RGB to HSB calculation

Engaged ,
Nov 06, 2023 Nov 06, 2023

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When I type RGB values or a hex code into Photoshop's color picker, it automatically calculates HSB values. What are the formulas used to calculate the H, S, and B values presented in the color picker tool?

Scott

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Windows

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Engaged , Jul 29, 2024 Jul 29, 2024

H = IF(180/PI()*ATAN2(2*R-G-B,SQRT(3)*(G-B))<0,180/PI()*ATAN2(2*R-G-B,SQRT(3)*(G-B))+360,180/PI()*ATAN2(2*R-G-B,SQRT(3)*(G-B)))

S=(Max(R,G,B)-Min(R,G,B))/Max(R,G,B)

B=Max(R,G,B)/255

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Community Expert ,
Nov 07, 2023 Nov 07, 2023

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Engaged ,
Jul 29, 2024 Jul 29, 2024

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H = IF(180/PI()*ATAN2(2*R-G-B,SQRT(3)*(G-B))<0,180/PI()*ATAN2(2*R-G-B,SQRT(3)*(G-B))+360,180/PI()*ATAN2(2*R-G-B,SQRT(3)*(G-B)))

S=(Max(R,G,B)-Min(R,G,B))/Max(R,G,B)

B=Max(R,G,B)/255