How except filters correctly

Hi there!
I have problems to set up filters in Config\Filters.php. The $gobals and $filters are handled within the Filter\Filter.php (processGlobals() and processFilters()). Somewhere I read to except a filter for a certain route it should be included in the $globals ('except => ['route scheme']). But as the processFilters are runned after the processGlobals any before globally excepted filter is added again if the path matches. It is not clear to me what I am doing wrong here and I couldn't find it in the official documentation.