Discussion
Match each mixing process with its usual primaries.
List I
A. Additive
B. Subtractive
C. Printing
D. Display
List II
1. cyan, magenta, yellow and black inks
2. red, green and blue lights
3. red, green and blue emitting elements
4. cyan, magenta and yellow colourants
Answer: B
Correct answer: A-2, B-4, C-1, D-3
Additive mixing works with light, so its primaries are red, green and blue, and a display realises them as emitting elements. Subtractive mixing works with colourants that remove light, so its primaries are cyan, magenta and yellow, and printing adds black to the three for the reasons of depth, ink coverage and text definition.
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