1 #!/usr/bin/env python 2 3 from array import array 4 import PIL.Image 5 import sys 6 7 def scale(v): 8 return (v + 43) / 85 9 10 def point(rgb): 11 return tuple(map(scale, rgb)) 12 13 def index(p): 14 return p[0] * 16 + p[1] * 4 + p[2] 15 16 def colour(i): 17 return (255 * (i % 2), 255 * ((i / 2) % 2), 255 * ((i / 4) % 2)) 18 19 tones = [ 20 "___", "_BB", "_BB", "BBB", # 00x 21 "_GG", "__C", "_BC", "BCC", # 01x 22 "_GG", "GGC", "BCC", "CCC", # 02x 23 "GGG", "GCC", "CCC", "CCC", # 03x 24 "_RR", "_MM", "MMB", "MBB", # 10x 25 "_YY", "_**", "_*B", "BBW", # 11x 26 "_GY", "GGC", "*CC", "CCW", # 12x 27 "GGY", "GGG", "GCC", "CCW", # 13x 28 "RRR", "RRM", "RMM", "MMM", # 20x 29 "RYY", "RRW", "RMW", "MMW", # 21x 30 "YYY", "YYW", "**W", "WWW", # 22x 31 "YYY", "YYW", "YWW", "WWW", # 23x 32 "RRR", "RMM", "RMM", "MMW", # 30x 33 "RRY", "RRY", "RMW", "MMW", # 31x 34 "YYY", "YYW", "YYW", "WWW", # 32x 35 "YYY", "YYW", "YYW", "WWW", # 33x 36 ] 37 38 colours = ["_", "R", "G", "Y", "B", "M", "C", "W"] 39 40 if __name__ == "__main__": 41 width = 320 42 input_filename, output_filename = sys.argv[1:3] 43 scaled_filename = (sys.argv[3:] + [None])[0] 44 rotate = "-r" in sys.argv[3:] 45 46 im = PIL.Image.open(input_filename) 47 if rotate: 48 im = im.rotate(270) 49 w, h = im.size 50 height = (width * h) / w 51 im = im.resize((width, height)) 52 53 for row in range(0, height): 54 for column in range(0, width): 55 rgb = im.getpixel((column, row)) 56 p = point(rgb) 57 i = index(p) 58 t = tones[i] 59 c = t[1] != "*" and t[1] or (row % 2) and t[2] != "*" and t[2] or t[0] != "*" and t[0] or t[2] 60 i = colours.index(c) 61 im.putpixel((column, row), colour(i)) 62 63 im.save(output_filename) 64 65 if scaled_filename: 66 im = im.resize((width / 2, height), PIL.Image.NEAREST) 67 im = im.resize((width, height), PIL.Image.NEAREST) 68 im.save(scaled_filename) 69 70 # vim: tabstop=4 expandtab shiftwidth=4