OpenEXR metadata fix.
OpenEXR metadata fix.

johnhaddon/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer