There have been many attempts to come up with colours spaces that are more perceptually uniform. This makes it difficult to create a mapping from a continuous variable to a set of colours. One problem with this space is that it is not perceptually uniform: the two colours that are one unit apart may look similar or very different depending on where they are in the colour space. You may be familiar with the RGB encoding of colour space, which defines a colour by the intensities of red, green and blue light needed to produce it. Fortunately for us the human eye only has three different colour receptors, and so we can summarise the perception of any colour with just three numbers. To characterise a colour completely, we need to know the complete mixture of wavelengths. Īt the physical level, colour is produced by a mixture of wavelengths of light. An excellent and more detailed exposition is available online at. Colour theory is complex because the underlying biology of the eye and brain is complex, and this introduction will only touch on some of the more important issues. Before we look at the details, it’s useful to learn a little bit of colour theory.
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