vray object ID integer (no AA) vs colour (AA)

[stevesideas]

If I create an image that is filtered and has AA how does ID integer work with it to select objects for colour correction ? I don't understand how an anti aliased image could ever work with one that isn't, for accurate selection. If I use the integer ID the selection for that specific object does not take into account the anti-aliasing of the main image so the selection is incorrect.