58     @return: A 3 element tuple containing the width, height and data of the
72 def image_write_to_ppm_file(filename, width, height, data):  argument
74     Write a PPM image with the given width, height and data.
78     @param height: PPM file height (pixels)
82     fout.write("%d %d\n" % (width, height))
88 def image_crop(width, height, data, x1, y1, dx, dy):  argument
93     @param height: Original image height
98     @param dy: Desired height of the cropped region
99     @return: A 3-tuple containing the width, height and data of the
103     if y1 > height - 1: y1 = height - 1
105     if dy > height - y1: dy = height - y1
114 def image_md5sum(width, height, data):  argument
119     @param height: PPM file height
122     header = "P6\n%d %d\n255\n" % (width, height)
128 def get_region_md5sum(width, height, data, x1, y1, dx, dy,  argument
134     @param height: Original image height
139     @param dy: Desired height of the cropped region
143     (cw, ch, cdata) = image_crop(width, height, data, x1, y1, dx, dy)
162         (width, height) = map(int, fin.readline().split())
163         assert(width > 0 and height > 0)
167         assert(size - size_read == width*height*3)
173 def image_comparison(width, height, data1, data2):  argument
178     @param height: Height of both images
181     @return: A 3-element tuple containing the width, height and data of the
188     while i < width*height*3:
210     return (width, height, newdata)
213 def image_fuzzy_compare(width, height, data1, data2):  argument
218     @param height: Height of both images
228     while i < width*height*3: