1 #!/usr/bin/env python 2 3 from itertools import combinations 4 from random import randint 5 import EXIF 6 import PIL.Image 7 import math 8 import sys 9 10 corners = [ 11 (0, 0, 0), (255, 0, 0), (0, 255, 0), (255, 255, 0), 12 (0, 0, 255), (255, 0, 255), (0, 255, 255), (255, 255, 255) 13 ] 14 15 def distance(rgb1, rgb2): 16 r1, g1, b1 = rgb1 17 r2, g2, b2 = rgb2 18 return math.sqrt(pow(r1 - r2, 2) + pow(g1 - g2, 2) + pow(b1 - b2, 2)) 19 20 def brightness(rgb): 21 return distance(rgb, (0, 0, 0)) 22 23 def factor(start, end, rgb): 24 r1, g1, b1 = start 25 r2, g2, b2 = end 26 gr, gg, gb = r2 - r1, g2 - g1, b2 - b1 27 r, g, b = rgb 28 pr, pg, pb = r - r1, g - g1, b - b1 29 dp = pr * gr + pg * gg + pb * gb 30 return dp / pow(distance(start, end), 2) 31 32 def darklight(rgb1, rgb2): 33 if brightness(rgb1) <= brightness(rgb2): 34 return rgb1, rgb2 35 else: 36 return rgb2, rgb1 37 38 def nearest(rgb, values=None): 39 l = map(lambda c: (distance(rgb, c), c), values or corners) 40 l.sort() 41 return l 42 43 def pattern(rgb): 44 l = nearest(rgb) 45 start, end = l[0][1], l[1][1] 46 f = factor(start, end, rgb) 47 #if f > 0.5: 48 # start, end = end, start 49 # f = 1 - f 50 return start, end, f 51 52 def choose(seq, f): 53 last = int(seq * math.sqrt(f)) 54 current = int((seq + 1) * math.sqrt(f)) 55 return last != current 56 57 def get_value(xy, rgb, width, height): 58 x, y = xy 59 rgb1, rgb2, f = pattern(rgb) 60 if choose(x + randint(0, width), f) and choose(y + randint(0, height), f): 61 return rgb2 62 else: 63 return rgb1 64 65 def get_best(rgb, values): 66 return nearest(rgb, values)[0][1] 67 68 def test(): 69 size = 512 70 for r in (0, 63, 127, 191, 255): 71 im = PIL.Image.new("RGB", (size, size)) 72 for g in range(0, size): 73 for b in range(0, size): 74 value = get_value((g, b), (r, (g * 256) / size, (b * 256 / size)), size, size) 75 im.putpixel((g, b), value) 76 im.save("rgb%d.png" % r) 77 78 def test_flat(rgb): 79 size = 64 80 im = PIL.Image.new("RGB", (size, size)) 81 for y in range(0, size): 82 for x in range(0, size): 83 im.putpixel((x, y), get_value((x, y), rgb, size, size)) 84 im.save("rgb%02d%02d%02d.png" % rgb) 85 86 def rotate_and_scale(im, width, height, rotate): 87 if rotate or x and x["Image Orientation"].values == [6L]: 88 im = im.rotate(270) 89 90 w, h = im.size 91 if w > h: 92 height = (width * h) / w 93 else: 94 width = (height * w) / h 95 96 return im.resize((width, height)) 97 98 if __name__ == "__main__": 99 if "--test" in sys.argv: 100 test() 101 sys.exit(0) 102 elif "--test-flat" in sys.argv: 103 test_flat((120, 40, 60)) 104 sys.exit(0) 105 106 width = 320 107 height = 256 108 109 input_filename, output_filename = sys.argv[1:3] 110 rotate = "-r" in sys.argv[3:] 111 112 x = EXIF.process_file(open(input_filename)) 113 im = PIL.Image.open(input_filename) 114 im = rotate_and_scale(im, width, height, rotate) 115 116 width, height = im.size 117 118 colours = [] 119 120 for y in range(0, height): 121 c = {} 122 for x in range(0, width): 123 rgb = im.getpixel((x, y)) 124 value = get_value((x, y), rgb, width, height) 125 im.putpixel((x, y), value) 126 if not c.has_key(value): 127 c[value] = 1 128 else: 129 c[value] += 1 130 c = [(n, value) for value, n in c.items()] 131 c.sort(reverse=True) 132 colours.append(c) 133 134 for y, c in enumerate(colours): 135 if len(c) <= 4: 136 continue 137 most = [value for n, value in c[:4]] 138 least = [value for n, value in c[4:]] 139 140 for x in range(0, width): 141 rgb = im.getpixel((x, y)) 142 if rgb in least: 143 value = get_best(rgb, most) 144 im.putpixel((x, y), value) 145 146 im.save(output_filename) 147 148 # vim: tabstop=4 expandtab shiftwidth=4