or if thats not good enough: http://www.openexr.com/ http://www.openexr.com/ has photoshop plugin aswell. No real support in the gimp though (cinepaint possibl

or if thats not good enough: http://www.openexr.com/ http://www.openexr.com/ has photoshop plugin aswell. No real support in the gimp though (cinepaint possibly has it though.)