
I'm pretty useless with anything like this, but in GIMP you can easily cut out an object by using the magic wand to delete surrounding colours, then convert the white background to transparent by using 'add alpha channel' then 'colour to alpha', so that you can stick your cutout over another picture. If you try to do this with a person wearing a white shirt, however, the shirt is made transparent as well so you can't effectively stick it over anything. I could just paint the shirt white again afterwards but it's full of folds and creases and woudln't look right as a block of white.
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Thu 18 Apr 2013, 23:17,
archived)

I must have been doing something stupid, it seems to work now...
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Thu 18 Apr 2013, 23:21,
archived)