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RGB vs. CMYK vs. Lab Color in PS

RGB vs. CMYK vs. Lab Color in PS

By colors, Design

RGB: Red, Green, Blue
– an additive color system (more color = brighter combination = white)

CMYK: Cyan, Magenta, Yellow, Black (Key)
– a subtractive color system (more color = darker combination = black)

Lab: Lightness + A&B
– lightness + a axis (vertical) [tint] & b axis (horizontal) [temperature]  
– color range of the human eye (larger gamut than RGB or CMYK)

credit source: industrydev.com