Thank you for your speedy response!  And yes, I was too hasty in firing off a 
request without the necessary details.

And in fact the resize from the PIL Image module does work:

f = Image.open('bird-of-paradise-flower-1.jpg')
r,c = f.size
f2 = f.resize((r//2,c//2))
f2.show()

shape(f) # returns(768, 1024, 3)

shape(f2) # returns (384, 512, 3)

I think I was confused about all the different "resize" methods floating about. 
 Clearly I had been using the wrong one!  But if f is defined - as I've just 
done - as an Image image, then it will use the correct resize method.

I'll crawl back under my rock now.

-Alasdair

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