Working on brighten bug on os x
Working on brighten bug on os x

git-svn-id: svn+ssh://blit.stanford.edu/usr/graphics/svn/levoy/FImage@5246 e85f4cc9-3b08-0410-8ae2-992ae7edad4e

Former-commit-id: fb5a5c0072db05e1b71131c19c53273cfba14b57
Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide