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Proceedings of The British Institute of Radiology

Recently there has been a much better understanding of how the human visual system perceives objects of different sizes and shapes under conditions of low contrast and/or camouflage. A number of demonstrations were given to illustrate the main factors involved.

Some of the colour conventions and usages of the designer do appear to be related to physiological optics, but a designer will only be able to realize the full information-potential of colour if he understands its parameters (hue, luminance and intensity), their relation to field contrast and the comparative strength and surface quality of the colour signal.