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Australian Disability Clearinghouse on Education and Training
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Effective Colour Contrast - Designing for People with Partial Sight and Colour Deficiencies

Guidelines for making effective colour choices in print and on the Web that work for nearly everyone. To understand them best, you need to understand the three perceptual attributes of colour: hue, lightness and saturation, in the particular way that vision scientists use them. (Aries Arditi)