107 lines
2.2 KiB
Python
Executable File
107 lines
2.2 KiB
Python
Executable File
#
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# Module color - do color conversions
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#
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ONE_THIRD=1.0/3.0
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ONE_SIXTH=1.0/6.0
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TWO_THIRD=2.0/3.0
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def rgb_to_yiq(r,g,b):
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y = 0.3*r + 0.59*g + 0.11*b
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i = 0.6*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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def _v(m1,m2,hue):
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if hue >= 1.0: hue = hue - 1.0
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if hue < 0.0: hue = hue + 1.0
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if hue < ONE_SIXTH:
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return m1 + (m2-m1)*hue*6.0
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if hue < 0.5:
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return m2
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if hue < TWO_THIRD:
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return m1 + (m2-m1)*(TWO_THIRD-hue)*6.0
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return m1
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def rgb_to_hls(r,g,b):
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maxc = max(r,g,b)
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minc = min(r,g,b)
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l = (minc+maxc)/2.0
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if minc == maxc:
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return 0.0, l, 0.0
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if l <= 0.5:
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s = (maxc-minc)/(maxc+minc)
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else:
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s = (maxc-minc)/(2-maxc-minc)
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rc = (maxc-r)/(maxc-minc)
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gc = (maxc-g)/(maxc-minc)
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bc = (maxc-b)/(maxc-minc)
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if r == maxc:
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h = bc-gc
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elif g == maxc:
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h = 2.0+rc-bc
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else:
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h = 4.0+gc-rc
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h = h/6.0
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if h < 0.0:
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h = h + 1.0
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return h,l,s
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def hls_to_rgb(h,l,s):
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if s == 0.0:
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return l,l,l
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if l <= 0.5:
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m2 = l * (1.0+s)
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else:
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m2 = l+s-(l*s)
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m1 = 2.0*l - m2
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return (_v(m1,m2,h+ONE_THIRD), _v(m1,m2,h), _v(m1,m2,h-ONE_THIRD))
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def rgb_to_hsv(r,g,b):
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maxc = max(r,g,b)
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minc = min(r,g,b)
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v = maxc
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if minc == maxc:
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return 0.0, 0.0, v
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s = (maxc-minc)/maxc
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rc = (maxc-r)/(maxc-minc)
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gc = (maxc-g)/(maxc-minc)
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bc = (maxc-b)/(maxc-minc)
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if r == maxc:
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h = bc-gc
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elif g == maxc:
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h = 2.0+rc-bc
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else:
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h = 4.0+gc-rc
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h = h/6.0
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if h < 0.0:
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h = h + 1.0
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return h,s,v
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def hsv_to_rgb(h,s,v):
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if s == 0.0:
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return v,v,v
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i = int(h*6.0)
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f = (h*6.0)-i
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p = v*(1.0-s)
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q = v*(1.0-s*f)
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t = v*(1.0-s*(1.0-f))
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if i in (0,6): return v,t,p
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if i = 1: return q,v,p
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if i = 2: return p,v,t
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if i = 3: return p,q,v
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if i = 4: return t,p,v
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if i = 5: return v,p,q
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print i, h, f
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print h, s, v
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raise 'Bad color'
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