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  1. from Cimpl import *
  2. import math
  3. file = choose_file()
  4.  
  5. image = load_image(file)
  6.  
  7. def grayscale(image: Image) -> Image:
  8.     """Return a grayscale copy of image.
  9.    
  10.     >>> image = load_image(choose_file())
  11.     >>> gray_image = grayscale(image)
  12.     >>> show(gray_image)
  13.     """
  14.     new_image = copy(image)
  15.     for x, y, (r, g, b) in image:
  16.  
  17.         # Use the pixel's brightness as the value of RGB components for the
  18.         # shade of gray. These means that the pixel's original colour and the
  19.         # corresponding gray shade will have approximately the same brightness.
  20.        
  21.         brightness = (r + g + b) // 3
  22.        
  23.         # or, brightness = (r + g + b) / 3
  24.         # create_color will convert an argument of type float to an int
  25.        
  26.         gray = create_color(brightness, brightness, brightness)
  27.         set_color(new_image, x, y, gray)    
  28.     #show (new_image)
  29.     return new_image
  30.  
  31.  
  32. def Sepia_channel():
  33.  
  34.     """
  35.     The funcion returns the selected image in a sepia filter, however it does not alter the original image.
  36.  
  37.     Ahmed Shakir - 101143951
  38.  
  39.     """
  40.     sepia_picture = grayscale(image)
  41.  
  42.     for x, y, (r,g,b) in sepia_picture:
  43.         if g < 63:
  44.             b*=0.9
  45.             r*=1.1
  46.             b= round (b)
  47.             r = round (r)
  48.         elif 63 <= g <= 191:
  49.             r*=1.15
  50.             b *= 0.85
  51.             r = round (r)
  52.             b = round (b)
  53.         elif g > 191 :
  54.             b*= 0.93
  55.             r*=1.08
  56.             b = round (b)
  57.             r= round (r)
  58.         sepia = create_color( r, g, b)
  59.         set_color(sepia_picture, x, y, sepia)  
  60.    
  61.     show(sepia_picture)  
  62.     return sepia_picture
  63.    
  64.  
  65.  
  66. def test_filter_grayscale (image):
  67.     gray_picture = grayscale (image)
  68.    
  69.     for x,y, (r,g,b) in gray_picture:
  70.        
  71.         r, g, b = get_color (gray_picture, x, y)
  72.         red, green, blue = get_color (image, x, y)    
  73.         brightness = (red + green + blue)// 3
  74.         if brightness== r and brightness == g and brightness == b:
  75.             continue
  76.         else:
  77.             return False
  78.     return True
  79.  
  80.  
  81. def test_filter_sepia (image):
  82.    
  83.     filtered_picture = Sepia_channel()
  84.     graypic = grayscale (image)  
  85.    
  86.  
  87.     graytest = test_filter_grayscale (image)
  88.    
  89.     if graytest == False:
  90.         return False  
  91.    
  92.     for x,y, (r,g,b) in filtered_picture:
  93.        
  94.         r,g,b = get_color (filtered_picture, x, y)
  95.         red, green, blue = get_color (graypic, x, y)
  96.         if red< 63 and r== round(red*1.1) :
  97.             continue
  98.         elif (red >= 63 and red<=191) and r == round(red*1.15):
  99.             continue
  100.         elif red>191 and r == round(red*1.08):
  101.             continue
  102.         else:
  103.             return False
  104.        
  105.         if blue< 63 and b== round(blue*0.9) :
  106.             continue
  107.         elif (blue >= 63 and blue<=191) and b == round(blue*0.85):
  108.             continue
  109.         elif blue>191 and b == round(blue*0.93):
  110.             continue
  111.         else:
  112.             return False    
  113.     return True
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