How to show PIL images on the screen?

From near the beginning of the PIL Tutorial:

Once you have an instance of the Image class, you can use the methods
defined by this class to process and manipulate the image. For
example, let’s display the image we just loaded:

     >>> im.show()

Update:

Nowadays the Image.show() method is formally documented in the Pillow fork of PIL along with an explanation of how it’s implemented on different OSs.

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