| # |
| # Module color - do color conversions |
| # |
| |
| ONE_THIRD=1.0/3.0 |
| ONE_SIXTH=1.0/6.0 |
| TWO_THIRD=2.0/3.0 |
| |
| def rgb_to_yiq(r,g,b): |
| y = 0.3*r + 0.59*g + 0.11*b |
| i = 0.6*r - 0.28*g - 0.32*b |
| q = 0.21*r- 0.52*g + 0.31*b |
| return (y,i,q) |
| def yiq_to_rgb(y,i,q): |
| r = y + 0.948262*i + 0.624013*q |
| g = y - 0.276066*i - 0.639810*q |
| b = y - 1.105450*i + 1.729860*q |
| if r < 0.0: r = 0.0 |
| if g < 0.0: g = 0.0 |
| if b < 0.0: b = 0.0 |
| if r > 1.0: r = 1.0 |
| if g > 1.0: g = 1.0 |
| if b > 1.0: b = 1.0 |
| return (r,g,b) |
| |
| def _v(m1,m2,hue): |
| if hue >= 1.0: hue = hue - 1.0 |
| if hue < 0.0: hue = hue + 1.0 |
| if hue < ONE_SIXTH: |
| return m1 + (m2-m1)*hue*6.0 |
| if hue < 0.5: |
| return m2 |
| if hue < TWO_THIRD: |
| return m1 + (m2-m1)*(TWO_THIRD-hue)*6.0 |
| return m1 |
| |
| def rgb_to_hls(r,g,b): |
| maxc = max(r,g,b) |
| minc = min(r,g,b) |
| l = (minc+maxc)/2.0 |
| if minc == maxc: |
| return 0.0, l, 0.0 |
| if l <= 0.5: |
| s = (maxc-minc)/(maxc+minc) |
| else: |
| s = (maxc-minc)/(2-maxc-minc) |
| rc = (maxc-r)/(maxc-minc) |
| gc = (maxc-g)/(maxc-minc) |
| bc = (maxc-b)/(maxc-minc) |
| if r == maxc: |
| h = bc-gc |
| elif g == maxc: |
| h = 2.0+rc-bc |
| else: |
| h = 4.0+gc-rc |
| h = h/6.0 |
| if h < 0.0: |
| h = h + 1.0 |
| return h,l,s |
| def hls_to_rgb(h,l,s): |
| if s == 0.0: |
| return l,l,l |
| if l <= 0.5: |
| m2 = l * (1.0+s) |
| else: |
| m2 = l+s-(l*s) |
| m1 = 2.0*l - m2 |
| return (_v(m1,m2,h+ONE_THIRD), _v(m1,m2,h), _v(m1,m2,h-ONE_THIRD)) |
| |
| def rgb_to_hsv(r,g,b): |
| maxc = max(r,g,b) |
| minc = min(r,g,b) |
| v = maxc |
| if minc == maxc: |
| return 0.0, 0.0, v |
| s = (maxc-minc)/maxc |
| rc = (maxc-r)/(maxc-minc) |
| gc = (maxc-g)/(maxc-minc) |
| bc = (maxc-b)/(maxc-minc) |
| if r == maxc: |
| h = bc-gc |
| elif g == maxc: |
| h = 2.0+rc-bc |
| else: |
| h = 4.0+gc-rc |
| h = h/6.0 |
| if h < 0.0: |
| h = h + 1.0 |
| return h,s,v |
| def hsv_to_rgb(h,s,v): |
| if s == 0.0: |
| return v,v,v |
| i = int(h*6.0) |
| f = (h*6.0)-i |
| p = v*(1.0-s) |
| q = v*(1.0-s*f) |
| t = v*(1.0-s*(1.0-f)) |
| if i in (0,6): return v,t,p |
| if i == 1: return q,v,p |
| if i == 2: return p,v,t |
| if i == 3: return p,q,v |
| if i == 4: return t,p,v |
| if i == 5: return v,p,q |
| print i, h, f |
| print h, s, v |
| raise 'Bad color' |