The five suggestions below offer just some of the practical ways to make your colour palettes as accessible as possible to as high a proportion of viewers possible. This means a significant proportion of viewers may not be able to perceive important such visual encodings. Such colour connotations are long-established and widely used, especially in financial or corporate contexts, but whilst they provide a certain immediacy in their meaning for many viewers, around 4.5% of the population are colour-blind (8% of men) with the red-green colour deficiency "Deuteranopia" being the most common form. These colours are used to convey notions of green = 'good' or 'above average' and red = 'bad' or 'below average' in some cultures, and the reverse in others. One of the most common colour metaphors used in visual displays involves the use of a red-green colour scheme, sometimes known as "RAG" or "traffic light" colours. Many visualisations use colours to represent data values, either to show quantitative scales or categorical classifications. What are five different ways to design for red-green colour-blindness? Focusing on just five is deliberately arbitrary and non-exhaustive: just enough to provide some different ideas but not enough to pretend to be definitive. Each will be framed around a specific 'everyday' challenge with five possible methods, ideas or observations presented. #COLOR ORACLE COLOR BLIND SERIES#In this series I am looking at different contextual, editorial, analytical, or design challenges encountered when working on data visualisation tasks.
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