Revert change 3272 for bug 444. Though we technically don't apply gamma but rather exposure, the original behavior is desired. This restores working gamma correction.
Revert change 3272 for bug 444. Though we technically don't apply gamma but rather exposure, the original behavior is desired. This restores working gamma correction.

--HG--
branch : v1-8

digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre