{"schema":"record/v1","id":"art_01M5MTAKY21A5B3P87DG77BY9A","type":"article","revision":1,"etag":"\"r1.s0\"","title":"Which colour-blind-safe qualitative palette and sequential colour map have primary sources, and what are the exact Okabe-Ito colours and their stated design rules?","summary":"Okabe and Ito (a primary page by two protanopes) propose an 8-colour qualitative palette with stated selection rules: vermilion rather than red, bluish green rather than green, reddish purple rather than violet, avoiding yellow-green, alternating warm and cool, and adding brightness or saturation differences when two warm or two cool colours are combined. Hex values are not in the page text (the palette is an image), so they were taken from R's source table (a secondary implementation, attributed in a code comment to Okabe and Ito). For continuous data, Crameri et al. 2020 (open access) recommend perceptually uniform, lightness-monotonic maps from a listed set rather than rainbow or red-green maps. Wong 2011 (Nature Methods) full text is paywalled.","status":"active","body":{"text":"Okabe and Ito (a primary page by two protanopes) propose an 8-colour qualitative palette with stated selection rules: vermilion rather than red, bluish green rather than green, reddish purple rather than violet, avoiding yellow-green, alternating warm and cool, and adding brightness or saturation differences when two warm or two cool colours are combined. Hex values are not in the page text (the palette is an image), so they were taken from R's source table (a secondary implementation, attributed in a code comment to Okabe and Ito). For continuous data, Crameri et al. 2020 (open access) recommend perceptually uniform, lightness-monotonic maps from a listed set rather than rainbow or red-green maps. Wong 2011 (Nature Methods) full text is paywalled.\n\nCurator qualifications: Verified the selection rules. Note: the page text gives some RGB/hex values in its guidance (e.g. vermilion #FF2000), so 'hex values are not in the page text' should be narrowed to 'the 8-colour palette chart is an image'. Narrow: the palette chart is an image, but the guidance text carries some RGB/hex values (e.g. vermilion #FF2000).\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://web.archive.org/web/20210803155953id_/https://jfly.uni-koeln.de/color/","note":"palette guidance"},{"url":"https://github.com/wch/r-source/blob/c39779accd1a64a5223f0061b451f8e46b0c7186/src/library/grDevices/R/colorstuff.R","note":"palette guidance"},{"url":"https://www.nature.com/articles/s41467-020-19160-7","note":"palette guidance"},{"url":"https://www.nature.com/articles/nmeth.1618","note":"palette guidance"}]},"categories":["T17","T20"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://web.archive.org/web/20210803155953id_/https://jfly.uni-koeln.de/color/","claim":"Okabe and Ito (a primary page by two protanopes) propose an 8-colour qualitative palette with stated selection rules: vermilion rather than red, bluish green rather than green, reddish purple rather than violet, avoiding yellow-green, alternating warm and cool, and adding brightness or saturation differences when two warm or two cool colours are combined. 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Hex values are not in the page text (the palette is an image), so they were taken from R's source table (a secondary implementation, attributed in a code comment to Okabe and Ito). For continuous data, Crameri et al. 2020 (open access) recommend perceptually uniform, lightness-monotonic maps from a listed set rather than rainbow or red-green maps. Wong 2011 (Nature Methods) full text is paywalled.\n\nCurator qualifications: Verified the selection rules. Note: the page text gives some RGB/hex values in its guidance (e.g. vermilion #FF2000), so 'hex values are not in the page text' should be narrowed to 'the 8-colour palette chart is an image'. 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