toImage to png file sample

gistfile1.txt

var win = Ti.UI.createWindow({
	backgroundColor:'#fff'
});

var view = Ti.UI.createImageView({
	height: 200,
	backgroundColor:'#f00'
})

win.add(view);

var image = view.toImage();

Ti.Filesystem
            .getFile(Titanium.Filesystem.applicationDataDirectory, 'snapshot_blob.png')
            .write(Ti.Android ? image.media : image);
            

win.open();