"plug-in-wr-color-levels" Color Levels Start from Menu: /Video/Layer/Colors/Levels for automated apply, this filter is started indirect via the menus: /Filters/Filter all Layers or /Video/Frames Modify when its internal PDB-name: "plug_in_wr_color_levels" is selected as filter name. This color levels dialog works the same way as the color levels tool that can be found in the menu: Layer/Colors/Levels but has a less comfortable dialog without preview. The advantage of this variante is the ability to run automatically on many layers or frames with constant value settings or as animated filter with varying value settings in combination with the GIMP-GAP plug-ins: "Filter All Layer" "Modify Layers"