gistfile1.txt

    var conversions = {
        'origin': {},
        'mythumb': {
            'w': 200,
            'format': 'jpg'
        },

    };

filepicker.getFile('*/*', {multiple: true, container:'window', metadata: true, conversions: conversions}, function(url, data){
           window.console.log(url, data);
       });