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colorandcontrast.com

This is a very deep dive into colour, contrast, and how people differ in how they see things. It has interactive examples throughout, which really help to illustrate the concepts. Definitely one worth a bookmark.

It begins with the biology of the eye, before going into colour vision and visual impairments, and different vision effects. It then covers properties of colour (lightness and hue, but also chromaticity and chroma), the relationships between colour, the different colour models used in technology (RGB vs CMYK etc) and different ways of measuring contrast.

It ends with a chapter on light vs dark mode, and a chapter on user interfaces and data visualisations, which will be perhaps the most relevant sections to skim through.

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