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.
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.