from PIL import Image
from PIL import ImageChops
from PIL import ImageEnhance
+from PIL import ImageFilter
thumb_size = 320, 320
+gaussian_kernel = ImageFilter.Kernel((3, 3), [1, 2, 1, 2, 4, 2, 1, 2, 1], 16)
class Comparer:
'''Image comparer.'''
self.diff = ImageChops.difference(self.src_im, self.ref_im)
+ def size_mismatch(self):
+ return self.ref_im.size != self.src_im.size
+
def write_diff(self, diff_image, fuzz = 0.05):
# make a difference image similar to ImageMagick's compare utility
mask = ImageEnhance.Brightness(self.diff).enhance(1.0/fuzz)
diff_im = Image.blend(self.src_im, diff_im, 0xcc/255.0)
diff_im.save(diff_image)
- def precision(self):
+ def precision(self, filter=False):
+ if self.size_mismatch():
+ return 0.0
+
+ diff = self.diff
+ if filter:
+ diff = diff.filter(gaussian_kernel)
+
# See also http://effbot.org/zone/pil-comparing-images.htm
- h = self.diff.histogram()
+ h = diff.histogram()
square_error = 0
for i in range(1, 256):
square_error += sum(h[i : 3*256: 256])*i*i
def ae(self, fuzz = 0.05):
# Compute absolute error
+
+ if self.size_mismatch():
+ return sys.maxint
+
# TODO: this is approximate due to the grayscale conversion
h = self.diff.convert('L').histogram()
ae = sum(h[int(255 * fuzz) + 1 : 256])
def is_image(path):
- return \
- path.endswith('.png') \
- and not path.endswith('.diff.png') \
- and not path.endswith('.thumb.png')
+ name = os.path.basename(path)
+ name, ext1 = os.path.splitext(name)
+ name, ext2 = os.path.splitext(name)
+ return ext1 in ('.png', '.bmp') and ext2 not in ('.diff', '.thumb')
def find_images(prefix):
- prefix = os.path.abspath(prefix)
if os.path.isdir(prefix):
prefix_dir = prefix
else:
optparser = optparse.OptionParser(
usage="\n\t%prog [options] <ref_prefix> <src_prefix>")
+ optparser.add_option(
+ '-v', '--verbose',
+ action="store_true", dest="verbose", default=False,
+ help="verbose output")
optparser.add_option(
'-o', '--output', metavar='FILE',
type="string", dest="output", default='index.html',
'-f', '--fuzz',
type="float", dest="fuzz", default=0.05,
help="fuzz ratio [default: %default]")
+ optparser.add_option(
+ '-a', '--alpha',
+ action="store_true", dest="alpha", default=False,
+ help="take alpha channel in consideration")
optparser.add_option(
'--overwrite',
action="store_true", dest="overwrite", default=False,
- help="overwrite")
+ help="overwrite images")
+ optparser.add_option(
+ '--show-all',
+ action="store_true", dest="show_all", default=False,
+ help="show all images, including similar ones")
(options, args) = optparser.parse_args(sys.argv[1:])
html.write('<html>\n')
html.write(' <body>\n')
html.write(' <table border="1">\n')
- html.write(' <tr><th>%s</th><th>%s</th><th>Δ</th></tr>\n' % (ref_prefix, src_prefix))
+ html.write(' <tr><th>File</th><th>%s</th><th>%s</th><th>Δ</th></tr>\n' % (ref_prefix, src_prefix))
+ failures = 0
for image in images:
ref_image = ref_prefix + image
src_image = src_prefix + image
root, ext = os.path.splitext(src_image)
delta_image = "%s.diff.png" % (root, )
if os.path.exists(ref_image) and os.path.exists(src_image):
- if options.overwrite \
- or not os.path.exists(delta_image) \
- or (os.path.getmtime(delta_image) < os.path.getmtime(ref_image) \
- and os.path.getmtime(delta_image) < os.path.getmtime(src_image)):
-
- comparer = Comparer(ref_image, src_image)
- comparer.write_diff(delta_image, fuzz=options.fuzz)
-
+ if options.verbose:
+ sys.stdout.write('Comparing %s and %s ...' % (ref_image, src_image))
+ comparer = Comparer(ref_image, src_image, options.alpha)
+ match = comparer.ae(fuzz=options.fuzz) == 0
+ if match:
+ result = 'MATCH'
+ bgcolor = '#20ff20'
+ else:
+ result = 'MISMATCH'
+ failures += 1
+ bgcolor = '#ff2020'
+ if options.verbose:
+ sys.stdout.write(' %s\n' % (result,))
html.write(' <tr>\n')
- surface(html, ref_image)
- surface(html, src_image)
- surface(html, delta_image)
+ html.write(' <td bgcolor="%s"><a href="%s">%s<a/></td>\n' % (bgcolor, ref_image, image))
+ if not match or options.show_all:
+ if options.overwrite \
+ or not os.path.exists(delta_image) \
+ or (os.path.getmtime(delta_image) < os.path.getmtime(ref_image) \
+ and os.path.getmtime(delta_image) < os.path.getmtime(src_image)):
+ comparer.write_diff(delta_image, fuzz=options.fuzz)
+ surface(html, ref_image)
+ surface(html, src_image)
+ surface(html, delta_image)
html.write(' </tr>\n')
html.flush()
html.write(' </table>\n')
html.write(' </body>\n')
html.write('</html>\n')
+ if failures:
+ sys.exit(1)
if __name__ == '__main__':
main()
projects / apitrace / blobdiff