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alphasierra
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‎colourmath/colourmath_python/colourmath.py

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######################
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#Colour Math Library
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######################
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######################
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#Constants
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######################
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#Reference Whites
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######################
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#CIE 1931 Colour Space
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######################
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#RGB to Tristim
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#Tristim to x y
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def TriTOxy(TriX,TriY,TriZ):
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if (not isinstance(TriX,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriY,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriZ,(int,float))):
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raise TypeError("Tristim value must be float or int")
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xCoord = (TriX/(TriX+TriY+TriZ))
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yCoord = (TriY/(TriX+TriY+TriZ))
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return [xCoord,yCoord]
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#Tristim to x
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def TriTOx(TriX,TriY,TriZ):
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if (not isinstance(TriX,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriY,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriZ,(int,float))):
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raise TypeError("Tristim value must be float or int")
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xCoord = (TriX/(TriX+TriY+TriZ))
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return xCoord
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#Tristim to y
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def TriTOy(TriX,TriY,TriZ):
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if (not isinstance(TriX,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriY,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriZ,(int,float))):
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raise TypeError("Tristim value must be float or int")
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yCoord = (TriY/(TriX+TriY+TriZ))
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return yCoord
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#xy to Tristim
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def xyTOTri(x,y,TriY):
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if (not isinstance(x,(int,float))):
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raise TypeError("x value must be float or int")
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if (not isinstance(y,(int,float))):
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raise TypeError("y value must be float or int")
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if (not isinstance(TriY,(int,float))):
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raise TypeError("TriY value must be float or int")
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XCoord = ((x/y)*TriY)
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ZCoord = (((1-x-y)/y)*TriY)
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return[XCoord,YCoord,ZCoord]
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######################
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#CIE 1960 Colour Space
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######################
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#Lightness from Luminance
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def YtoL(luminance):
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#Reference White Luminance
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Y_n = 1 ##TODO
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if (not isinstance(luminance,(int,float))):
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raise TypeError("Luminance value must be float or int")
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return lightness
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#Lightness from normalized Luminance
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def YNormalizedtoL(luminance):
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if (not isinstance(luminance,(int,float))):
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raise TypeError("Luminance value must be float or int")
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return lightness
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#Tristim to u v
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def TriTOuv(TriX,TriY,TriZ):
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if (not isinstance(TriX,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriY,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriZ,(int,float))):
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raise TypeError("Tristim value must be float or int")
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uCoord = ((4*TriX)/(TriX+15*TriY+3*TriZ))
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vCoord = ((9*TriY)/(TriX+15*TriY+3*TriZ))
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return[uCoord,vCoord]
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#Tristim to u
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def TriTOu(TriX,TriY,TriZ):
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if (not isinstance(TriX,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriY,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriZ,(int,float))):
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raise TypeError("Tristim value must be float or int")
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uCoord = ((4*TriX)/(TriX+15*TriY+3*TriZ))
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return uCoord
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#Tristim to v
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def TriTOv(TriX,TriY,TriZ):
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if (not isinstance(TriX,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriY,(int,float))):
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raise TypeError("Tristim value must be float or int")
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if (not isinstance(TriZ,(int,float))):
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raise TypeError("Tristim value must be float or int")
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vCoord = ((9*TriY)/(TriX+15*TriY+3*TriZ))
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return vCoord
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###################################
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#CIE 1931 to/from 1960 Colour Space
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###################################
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#x y to u v
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def xyTOuv(xCoord, yCoord):
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if (not isinstance(xCoord,(int,float))):
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raise TypeError("xCoord value must be float or int")
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if (not isinstance(yCoord,(int,float))):
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raise TypeError("yCoord value must be float or int")
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uCoord = ((4*xCoord)/(3-2*xCoord+12*yCoord))
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vCoord = ((9*yCoord)/(3-2*xCoord+12*yCoord))
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return[uCoord,vCoord]
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#uv to xy
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def uvTOxy(uCoord, vCoord):
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if (not isinstance(uCoord,(int,float))):
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raise TypeError("uCoord value must be float or int")
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if (not isinstance(vCoord,(int,float))):
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raise TypeError("vCoord value must be float or int")
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xCoord = ((9*uCoord)/(6*uCoord-16*vCoord+12))
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yCoord = ((4*vCoord)/(6*uCoord-16*vCoord+12))
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return[xCoord,yCoord]
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##############
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#Calculate CCT
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##############
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#CCT from xy
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def CCTxy(xCoord, yCoord):
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if (not isinstance(xCoord,(int,float))):
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raise TypeError("xCoord value must be float or int")
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if (not isinstance(yCoord,(int,float))):
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raise TypeError("yCoord value must be float or int")
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n = ((xCoord-0.320)/(0.1858-yCoord))
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CCT = 449*(n**3) + 3525*(n**2) + 6823.3*(n**2) + 5520.33*
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return CCT
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#CCT from TriStim
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def CCT_Tri(TriX,TriY,TriZ):
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if (not isinstance(TriX,(int,float))):
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raise TypeError("TriX value must be float or int")
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if (not isinstance(TriY,(int,float))):
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raise TypeError("TriY value must be float or int")
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if (not isinstance(TriZ,(int,float))):
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raise TypeError("TriZ value must be float or int")
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n = ((xCoord-0.320)/(0.1858-yCoord))
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CCT = 449*(n**3) + 3525*(n**2) + 6823.3*(n**2) + 5520.33*
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return CCT
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#cct from RGB --> noep
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#def CCT_RGB(RedVal, GreenVal, BlueVal):
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#
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# if (not isinstance(RedVal,(int,float))):
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# raise TypeError("RedVal value must be float or int")
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#
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# if (not isinstance(GreenVal,(int,float))):
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# raise TypeError("GreenVal value must be float or int")
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#
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# if (not isinstance(BlueVal,(int,float))):
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# raise TypeError("BlueVal value must be float or int")
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#
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# n = ((xCoord-0.320)/(0.1858-yCoord))
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# CCT = 449*(n**3) + 3525*(n**2) + 6823.3*(n**2) + 5520.33*
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#
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# return CCT
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##TODO
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#Standard Observer Lookup Table
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def CIE1931Observer(wavelength):
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CMF = { 350 : thing1,
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351 : thing2,
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}
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