What is the RGB co-ordinates of a colour at (0.25, 0.65, 0) in CMY space?
2021
What is the RGB co-ordinates of a colour at (0.25, 0.65, 0) in CMY space?
Answer: D. (0.75, 0.35, 1) — The CMY colour model is subtractive and is the complement of the additive RGB model: each RGB channel is obtained by subtracting the corresponding CMY value…
- A.
(0.75, 0.25, 1)
- B.
(0.85, 0.25, 0)
- C.
(0.65, 0.25, 0)
- D.
(0.75, 0.35, 1)
Attempted by 209 students.
Show answer & explanation
Correct answer: D
The CMY colour model is subtractive and is the complement of the additive RGB model: each RGB channel is obtained by subtracting the corresponding CMY value from 1 — R = 1 − C, G = 1 − M, B = 1 − Y — with every value expressed on the 0–1 scale.
R = 1 − C = 1 − 0.25 = 0.75
G = 1 − M = 1 − 0.65 = 0.35
B = 1 − Y = 1 − 0 = 1
Converting the result back with the inverse relation C = 1 − R, M = 1 − G, Y = 1 − B reproduces (0.25, 0.65, 0), confirming the conversion.
So the RGB co-ordinate is (0.75, 0.35, 1).