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The RGB colour model is described as additive because

  • A.combining the primaries produces white light
  • B.each primary subtracts light from the white paper
  • C.the values are added to a fixed grey background
  • D.the three channels are summed into one number

Answer: A

Red, green and blue light overlapping at full strength give white, which is why every screen uses the model. Ink works the other way about, removing wavelengths from the light reflected off the sheet, so printing needs a different model entirely.

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