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RGB Color Gradation Function

/ Published in: Python
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  1. import string
  2.  
  3. def make_color_tuple( color ):
  4.     """
  5.     turn something like "#000000" into 0,0,0
  6.     or "#FFFFFF into "255,255,255"
  7.     """
  8.     R = color[1:3]
  9.     G = color[3:5]
  10.     B = color[5:7]
  11.  
  12.     R = int(R, 16)
  13.     G = int(G, 16)
  14.     B = int(B, 16)
  15.  
  16.     return R,G,B
  17.  
  18. def interpolate_tuple( startcolor, goalcolor, steps ):
  19.     """
  20.     Take two RGB color sets and mix them over a specified number of steps.  Return the list
  21.     """
  22.     # white
  23.  
  24.     R = startcolor[0]
  25.     G = startcolor[1]
  26.     B = startcolor[2]
  27.  
  28.     targetR = goalcolor[0]
  29.     targetG = goalcolor[1]
  30.     targetB = goalcolor[2]
  31.  
  32.     DiffR = targetR - R
  33.     DiffG = targetG - G
  34.     DiffB = targetB - B
  35.  
  36.     buffer = []
  37.  
  38.     for i in range(0, steps +1):
  39.         iR = R + (DiffR * i / steps)
  40.         iG = G + (DiffG * i / steps)
  41.         iB = B + (DiffB * i / steps)
  42.  
  43.         hR = string.replace(hex(iR), "0x", "")
  44.         hG = string.replace(hex(iG), "0x", "")
  45.         hB = string.replace(hex(iB), "0x", "")
  46.  
  47.         if len(hR) == 1:
  48.             hR = "0" + hR
  49.         if len(hB) == 1:
  50.             hB = "0" + hB
  51.  
  52.         if len(hG) == 1:
  53.             hG = "0" + hG
  54.  
  55.         color = string.upper("#"+hR+hG+hB)
  56.         buffer.append(color)
  57.  
  58.     return buffer
  59.  
  60. def interpolate( startcolor, goalcolor, steps ):
  61.     """
  62.     wrapper for interpolate_tuple that accepts colors as html ("#CCCCC" and such)
  63.     """
  64.     start_tuple = make_color_tuple(startcolor)
  65.     goal_tuple = make_color_tuple(goalcolor)
  66.  
  67.     return interpolate_tuple(start_tuple, goal_tuple, steps)
  68.  
  69.  
  70.  
  71. def printchart(startcolor, endcolor, steps):
  72.  
  73.     colors = interpolate(startcolor, endcolor, steps)
  74.  
  75.     for color in colors:
  76.         print color
  77.  
  78.  
  79. # Example... show us 16 values of gradation between these two colors
  80. printchart("#999933", "#6666FF", 16)

URL: http://www.elifulkerson.com/projects/rgb-color-gradation.php

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