Created
September 13, 2018 20:26
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Ruby font colour based on background colour. Outputs white or black based on hex luminance.
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| def text_colour(bg_colour) | |
| rgb = [bg_colour[0..1], bg_colour[2..3], bg_colour[4..5]].map! do |c| | |
| c = c.to_i(16).to_f / 255.0 | |
| c <= 0.03928 ? c / 12.92 : ((c + 0.055) / 1.055)**2.4 | |
| end | |
| (0.2126 * rgb[0] + 0.7152 * rgb[1] + 0.0722 * rgb[2]) <= 0.5 ? "fff" : "000" | |
| end |
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