The standard rainbow should not be used to represent continuous data, because it creates artificial thresholds humans do not see the spectrum as a smooth ramp. Color Oracle downloadable, free color blindness simulator for Windows, Mac and Linux.Sim Daltonism simulates color blind vision and displays the results in a floating palette for macOS and iOS.Typically they take a web page or image file as an input, and render a colour-blind simulated image as output: The following utilities may be of use in determining whether a revised image is distinguishable to colour-blind users. If you are colour-blind yourself, check your revised image with a colour-sighted person to confirm the meaning is intact. Instead use non-colour techniques such as labelling, font styles (bold or italic), line styles (dots and dashes) or cross-hatching (stripes, checkers or polka-dots). Do not use light or dark variants of the colours. Use bright mid-range colours, like children's crayons.For small expanses of colour, such as thin lines, clearly label them with text, or use non-colour techniques such as font styles (bold or italic), line styles (dots and dashes) or cross-hatching (stripes, checkers or polka-dots).If you're colouring text, use bold and a large font. Do not use more than one colour from any one column.
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