Help - Colour to white preserving shadows

[legrand]

Hello guys, can someone help me on this picture?

[img=http://img337.imageshack.us/img337/8536/testjj2.th.jpg]

I need to remove the green and blue colours of this image, replacing them for white, as the background colour, however I need to preserv the shapes and shadows.

Any hint?

Thanks

 

[jyxpearl]

sorry , i can't.

 

[F15pilotX]

*cough* spam >_>



Pearl, you might be able to use a gradient map to do it, but I don't know how exactly you'd go about it; hopefully others know more about this topic than i do and can help more