Grass Valley DD10 part 1 - Manual (Page 60)

2.8 Operation of the keyer menus Diamond digital DD10
54
2.8.8 FORGROUND FADE-MENU
LUMOFS positive luminance offset to the subtractive key color luminance
(only in the FG Fade mode).
Raises or lowers the luminance level in the transition areas.
Can be used in order to brighten too dark object edges
or to darken too bright edges, for better matching them to the
background scene.
Also see FG Fade in the Keyers panel.
You will find further information in the corresponding sections of the Keyers panels or in the descriptions of
the other Keyer menus.