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I haven't tried this test but it may be worth investigating:
Build a small site with one image on each page, each with a different tactic: image1 - keyword file name, image2 - keyword alt text, image3 - keyword title text, image4 - keyword around image, image5 - keyword in folder name, image6 - keyword in page title, etc...
Link up and wait until the site gets indexed in G Images and then see what images come up for the keyword. Use an obscure keyword to make it easier. This may also give you a readout on the relative value of each method.
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