Originally Posted by mkellypc
...Care to recap procedure for adjusting gamma?...
Note entering Service Menu is harmless. Changing the wrong thing can be catastrophic. Therefore, if you don't know what a setting does, do not adjust it.
Prior to entering the Service Menu, note your user settings (brightness, contrast, tint, etc.) for each input as they will placed at default settings by entering the Service Menu.
To enter Service Menu: With TV in the off state, enter the following string on the factory remote control:
MUTE → 1 → 8 → 2 → POWER (You have to enter this sequence rather quickly. Some people have had to try it a couple times to get it to take, but that's not a problem)
To navigate and change values:
↕ to scroll up and down through menus
↔ or SELECT to enter sub-menus
↔ change values within sub-menus
MENU to back out of sub-menus
SOURCE to switch between inputs
POWER to save and exit
wait at least 30 seconds before powering back up
you will need to restore user settings for each input
To adjust gamma:
SM → DDP3021→ GAMMA / CINEMA GAMMA
Here's the DDP3021 screen: