[pygtk] Combining images

[MLA (Peter Clark)]

	I am trying to figure out how to combine images using PyGTK, and after Google 
didn't turn up anything helpful, I thought I would ask the list. What I want 
to do is place two images (image1.png and image2.png) on top of a third 
(background.png). image1 and image2 are transparent, so I need to create a 
mask for each of them. image1 is the same size as the background, so its box 
is just the upper left corner; image2 is a much smaller image that goes in a 
specific location. If I do this with PIL (the Python Imaging Library), it's 
dead simple:

import Image
back = Image.open('background.png')
image1 = Image.open('image1.png')
image2 = Image.open('image2.png')
# paste(image, box, mask)
back.paste(image1, (0, 0), image1)
back.paste(image2, (3, 40), image2)
back.save('result.png')

However, I would prefer not to pull in an extra dependency. How can I do the 
same GTK?
	Thanks,
	:Peter