RGB colour and colour perception

About RGB colour and colour perception
  • The human eye, and so visual perception, is tuned to the visible spectrum and so to spectral colours between red and violet.
  • RGB colour is a model used to reproduce colour in a way that matches perception.
  • An RGB colour wheel helps to simulate:
    • The effect of projecting lights with wavelengths corresponding to the three primary colours, red, green and blue onto a neutral-coloured surface.
    • The additional colours produced by mixing adjacent pairs of colours such as adjacent primary, secondary, tertiary colours etc.
  • Every imaginable colour can be produced by the RGB colour model.
  • Remember that the RGB is an additive colour model used when mixing light of different wavelengths.
  • The CMYK subtractive colour model is often used when mixing paints, dyes and pigments.

Seeing colour

About seeing colour
  • When an observer asks themselves what colour something is, they might refer to:
    • Spectral colours and use names commonly associated with rainbows (ROYGBV)
    • An extended vocabulary of colour names such as dark red, vermilion, golden yellow, lemon yellow, pale yellow, greenish-yellow, chartreuse, leaf green or light green.
    • A specific colour model such as RGB, CMYK or HSB
    • A family of colours such as warm or cool colours
    • Tints or shades of colours
    • A palette of colours they have selected or are working with.