11 lines
435 B
Python
11 lines
435 B
Python
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def lum(h):
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h=h.lstrip('#'); r,g,b=[int(h[i:i+2],16)/255 for i in (0,2,4)]
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f=lambda c: c/12.92 if c<=0.03928 else ((c+0.055)/1.055)**2.4
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return 0.2126*f(r)+0.7152*f(g)+0.0722*f(b)
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def cr(a,b):
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la,lb=sorted([lum(a),lum(b)],reverse=True); return (la+0.05)/(lb+0.05)
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import sys
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pairs=[l.split() for l in sys.stdin if l.strip()]
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for p in pairs:
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print(f"{p[0]:>9} on {p[1]:>9} {cr(p[0],p[1]):5.2f} {' '.join(p[2:])}")
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