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23 lines
741 B
Python
23 lines
741 B
Python
"""
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Calculate the contrast between two colors
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"""
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def contrast(background, light, dark, threshold=0.179):
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"""
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background: tuple of (r, g, b) values
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light: color to use if the background is light
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dark: color to use if the background is dark
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threshold: the threshold to use for determining lightness, the default is w3 recommended
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"""
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red = background[0]
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green = background[1]
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blue = background[2]
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# Calculate contrast
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uicolors = [red / 255, green / 255, blue / 255]
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cont = [col / 12.92 if col <= 0.03928 else ((col + 0.055) / 1.055) ** 2.4 for col in uicolors]
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lightness = (0.2126 * cont[0]) + (0.7152 * cont[1]) + (0.0722 * cont[2])
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return light if lightness > threshold else dark
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