What is the fastest way to draw an image from discrete pixel values in Python?

Question

I wish to draw an image based on computed pixel values, as a means to visualize some data. Essentially, I wish to take a 2-dimensional matrix of color triplets and render it

Answer 1

import Image
im= Image.new('RGB', (1024, 1024))
im.putdata([(255,0,0), (0,255,0), (0,0,255)])
im.save('test.png')

Puts a red, green and blue pixel in the top-left of the image.

im.fromstring() is faster still if you prefer to deal with byte values.