21 lines
478 B
Python
21 lines
478 B
Python
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#
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# Module color - do color conversions
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#
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def rgb_to_yiq(r,g,b):
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y = 0.30*r + 0.59*g + 0.11*b
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i = 0.60*r - 0.28*g - 0.32*b
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q = 0.21*r - 0.52*g + 0.31*b
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return (y,i,q)
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def yiq_to_rgb(y,i,q):
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r = y + 0.948262*i + 0.624013*q
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g = y - 0.276066*i - 0.639810*q
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b = y - 1.105450*i + 1.729860*q
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if r < 0.0: r = 0.0
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if g < 0.0: g = 0.0
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if b < 0.0: b = 0.0
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if r > 1.0: r = 1.0
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if g > 1.0: g = 1.0
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if b > 1.0: b = 1.0
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return (r,g,b)
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