ImageWriter : Remove unnecessary manual string substitutions.
ImageWriter : Remove unnecessary manual string substitutions.

GafferHQ/gaffer,lucienfostier/gaffer,boberfly/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,andrewkaufman/gaffer,ImageEngine/gaffer,ImageEngine/gaffer,hradec/gaffer,ivanimanishi/gaffer,appleseedhq/gaffer,ivanimanishi/gaffer,hradec/gaffer,hradec/gaffer,chippey/gaffer,ivanimanishi/gaffer,appleseedhq/gaffer,GafferHQ/gaffer,boberfly/gaffer,johnhaddon/gaffer,hradec/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,andrewkaufman/gaffer,ImageEngine/gaffer,chippey/gaffer,johnhaddon/gaffer,boberfly/gaffer,lucienfostier/gaffer,chippey/gaffer,chippey/gaffer,hradec/gaffer,ImageEngine/gaffer,boberfly/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,johnhaddon/gaffer