Someone from the ABC message board did a similar thing, with a different result:
http://img414.imageshack.us/my.php?image=swan6dp.png
Just for fun, I did a comparison, with no Photoshopping at all. I compared the three images, your original one from lost-media, which we will take as gold, mine with the blue lines and the other with the black lines. Take a look and tell me if you think mine looks a little closer to the source than the one you just posted. I can distort the original image to make it look like an octagon if I want too and draw out a line of the swan.
LINK
Now I don't know for sure, as GStrot stated about the distortion from a crash or a Hollywood set looking like a crash, that this isn't a DHARMA symbol and I cannot tell at all what is inside the symbol, swan or somthing else. What I can tell you is that my picture looks like the original and the one you posted was altered to make it look like what they wanted it to look like.