Shooting star?

Today when i was looking at orion i took some pictures. On one of the
pictures i saw something strange.. But it is only visible when i change the
curves of the photo... It's just below orions belt and i don't know what it
is... Is it a shooting star? It's nothing on the lens because it's the only
picture where i can see such a thing so can anybody tell something about it?

http://www.passero.be/astro/orion.jpg the original one
http://www.passero.be/astro/orionb.jpg the other one.