VIPS SMP benchmark
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This is adapted from the system used to generate images for POD:

  http://cima.ng-london.org.uk/~john/POD

Images from a 10k by 10k studio digital camera are colour processed, resized,
cropped and sharpened. 

This thing was originally processing images off a remote server over a 100mbit
network. No attempt was made to make it quick (there was no point): you 
could make it a lot faster very easily.

See

 http://www.vips.ecs.soton.ac.uk/index.php?title=Benchmarks

for results.