I've tried fixing them in photoshop, with no luck.
Sorry, I uploaded the image to a facebook gallery, which seems to have swapped it to a jpg.
Here;

I need to re-work my rendering I think. The reason that I did it this way is because I want the ambient occlusion 'shadows' from the ground plain (also pink) so that once it's tranceparrent I get just hte shadows, and not the pink.
However, now that I've had a think about it some more, I dont this that this would work as therea re gradients of pink that i would want to remove the pink from, just leaving the colored shadows.
I get the shadows and AND render an alpha chanel, because the ground plain needs to have ) alpha to receive the shadows, so I think I need to figure out a way to do this. I've tryed re-rendering onto a white ground plane, but with similar problems.
If there's a code way of doing it, it would be great
That way I can have my cake and eat it. I think I may have just made this way to complicated for myself.
Thanks for the help guys.