ITPEC IP April 2026 Question 25
On a display screen, various colors are created through additive color mixing with three colors, namely red, green, and blue. When the red, green, and blue are mixed evenly, which of the following colors is formed?
Explanation
White — mixing red, green and blue light in equal amounts gives white in additive colour mixing.
A display emits light, so its colours are made by adding light: with no light the screen is black, and each primary added makes the result brighter.
- •Red + green = yellow
- •Green + blue = cyan
- •Blue + red = magenta (red-violet)
- •Red + green + blue, evenly = white (at lower equal levels, grey)
Answer (c)
Why not others:
- •(a) Red-violet — red and blue only, with no green
- •(b) Yellow — red and green only, with no blue
- •(d) Green rust — a dull bluish green, which needs green and blue to outweigh red; even mixing gives no hue at all
Key rule: Additive mixing (RGB, light from screens) goes towards white; subtractive mixing (CMY, inks on paper) goes towards black, which is why printers add a K (black) ink.
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