What does RGB stand for?
AnswerRed, green, blue
RGB names the three primary colors of light that screens mix to make other colors.
Science · Facts & stats
RGB facts & stats
7 fact-checked facts about the RGB color model and light, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
In 8-bit-per-channel RGB, what is the highest value a channel can have?
Answer255
Eight bits give 256 levels, numbered 0 to 255.
Going deeper
Which hex color code is pure red?
Answer#FF0000
Hex codes list red, green, blue in pairs; FF is full red with no green or blue.
What color do green and blue light make together?
AnswerCyan
Green plus blue light gives cyan, one of the secondary colors of light.
How many types of cone cells do people with typical color vision have?
Answer3
Typical human color vision uses three cone types, sensitive to long, medium and short wavelengths.
Expert level
In additive color mixing, which color of light combines with blue to make white?
AnswerYellow
Yellow light already holds red and green, so adding blue completes white; they are complementary.
Roughly what range of wavelengths can the human eye see?
AnswerAbout 380 to 750 nanometers
Visible light spans roughly 380 nm (violet) to 750 nm (red).
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