RGB to CMYK conversion formula
The R,G,B values are divided by 255 to change the range from 0..255 to 0..1:
R' = R/255
G' = G/255
B' = B/255
The black key (K) color is calculated from the red (R'), green (G') and blue (B') colors:
K = 1-max(R', G', B')
The cyan color (C) is calculated from the red (R') and black (K) colors:
C = (1-R'-K) / (1-K)
The magenta color (M) is calculated from the green (G') and black (K) colors:
M = (1-G'-K) / (1-K)
The yellow color (Y) is calculated from the blue (B') and black (K) colors:
Y = (1-B'-K) / (1-K)
RGB to CMYK table
| Color |
Color
name |
(R,G,B) | Hex | (C,M,Y,K) |
|---|---|---|---|---|
| Black | (0,0,0) | #000000 | (0,0,0,1) | |
| White | (255,255,255) | #FFFFFF | (0,0,0,0) | |
| Red | (255,0,0) | #FF0000 | (0,1,1,0) | |
| Green | (0,255,0) | #00FF00 | (1,0,1,0) | |
| Blue | (0,0,255) | #0000FF | (1,1,0,0) | |
| Yellow | (255,255,0) | #FFFF00 | (0,0,1,0) | |
| Cyan | (0,255,255) | #00FFFF | (1,0,0,0) | |
| Magenta | (255,0,255) | #FF00FF |
(0,1,0,0) |