Created
July 18, 2010 12:03
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calculate contrast color in Ruby
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| def convert_to_brightness_value(background_hex_color) | |
| (background_hex_color.scan(/../).map {|color| color.hex}).sum | |
| end | |
| def contrasting_text_color(background_hex_color) | |
| convert_to_brightness_value(background_hex_color) > 382.5 ? '#000' : '#fff' | |
| end |
FF FF FF is 255 255 255.
382.5 is (255*3) / 2
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how is the 382.5 benchmark decided ? White has brightness value as 0, and for black, it comes as 510, so why not 510/2 = 255 ?