How to access depth (z) buffer data of a render result from python My issue is that I want to access the buffer data from python, pixel after pixel, for being able to use it for arbitrary computations. How can I achieve this?

(Please dont tell me about exporting to different kinds of formats like exr etc, because I want to do computations  in place). 

Also I'm talking about blender 2.68 or higher.
Image.pixel is not available for Render Results, nor does it contain depth-information.

You can get the depth in Node Compositor / Cycles, but I don't believe it's possible to read with python in-place.