[amelius]

One problem with bokeh is that it disappears when you scale the image down. Perhaps this technique can help solve that (but I suppose there would be better ways to do this).

Anyway, the entire technique is also very easy to do manually with Photoshop.

[dreamer7]

I don't have much experience with Photoshop. Would it be possible to record some sort of macro in it to automatically transform any image?

If not, this approach seems to have merit

[inakarmacoma]

Yes, Photoshop supports pretty customizable recorded and custom actions. Can also process multiple files in bulk/batch.