def difference(cls, prev_image, current_image):
"""
params are filenames
"""
print 'diffing', prev_image, current_image
f, name = cls._get_tmp_file(EXTRACT_TYPE_DIFF)
print 'Saving diff to', name
"""
# PIL -- This complains that some pairs of images 'do not match' Even when
# they are generated from the same PSD and are the same pixel size. WTF.
# USING IMAGEMAGICK INSTEAD, BITCHES
p = PILImage.open(prev_image)
c = PILImage.open(current_image)
diff = ImageChops.difference(c, p)
diff.save(f, cls.dest_format) #TODO catch IOError and do something with it.
f.close()
del p
del c
del diff
"""
image = Image(current_image)
other = Image(prev_image)
isize = image.size
osize = other.size
offset = (0,0)
if isize != osize:
#enabling this makes the diff always the same size as the largest one
#disabling makes it the size of the most current one. Hopefully this doesnt
#happen very often...
if False:#isize < osize: #basically, if both x and y components are less
#swap; image is always the larger one
tmp = image
image = other
other = tmp
tmp = isize
isize = osize
osize = tmp
offset = ((isize[0] - osize[0])/2, (isize[1] - osize[1])/2)
image.composite(other, offset, operator=wand.DIFFERENCE_COMPOSITE_OP)
f.write(image.dump(cls.dest_format))
f.close()
image.destroy()
other.destroy()
return ExtractedFile(name, EXTRACT_TYPE_DIFF)
def difference(cls, prev_image, current_image):
"""
params are filenames
"""
print 'diffing', prev_image, current_image
f, name = cls._get_tmp_file(EXTRACT_TYPE_DIFF)
print 'Saving diff to', name
"""
# PIL -- This complains that some pairs of images 'do not match' Even when
# they are generated from the same PSD and are the same pixel size. WTF.
# USING IMAGEMAGICK INSTEAD, BITCHES
p = PILImage.open(prev_image)
c = PILImage.open(current_image)
diff = ImageChops.difference(c, p)
diff.save(f, cls.dest_format) #TODO catch IOError and do something with it.
f.close()
del p
del c
del diff
"""
image = Image(current_image)
other = Image(prev_image)
isize = image.size
osize = other.size
offset = (0, 0)
if isize != osize:
#enabling this makes the diff always the same size as the largest one
#disabling makes it the size of the most current one. Hopefully this doesnt
#happen very often...
if False: #isize < osize: #basically, if both x and y components are less
#swap; image is always the larger one
tmp = image
image = other
other = tmp
tmp = isize
isize = osize
osize = tmp
offset = ((isize[0] - osize[0]) / 2, (isize[1] - osize[1]) / 2)
image.composite(other, offset, operator=wand.DIFFERENCE_COMPOSITE_OP)
f.write(image.dump(cls.dest_format))
f.close()
image.destroy()
other.destroy()
return ExtractedFile(name, EXTRACT_TYPE_DIFF)
def convert(source_fh, source_type, dest_type, dest_size):
"""somewhat like convert(1)"""
i = Image(source_fh, source_type)
if not i.select(dest_size):
print "bad size"
i.alpha(True)
i.scale(dest_size)
i.alpha(True)
result = i.dump(dest_type)
return result
