Multiplying a tuple by a scalar
Might be a nicer way, but this should work
tuple([10*x for x in img.size])
img.size = tuple(i * 10 for i in img.size)
The pythonic way would be using a list comprehension:
y = tuple([z * 10 for z in img.size])
Another way could be:
y = tuple(map((10).__mul__, img.size))