Grundig 30GB - Manual (Page 66)

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Image Play Setting
1.
If you press the [MENU] button long on the file search screen or during
playing image file, the image play setting screen appears and you can set
image play environment.
Set transparency of the setting menu screen from ‘Half Tone’ of the ‘General
‘item of ‘SYSTEM SET’ menu on the main menu screen.
2.
Push the jog button in
∧ or ∨ direction to select an item to set and push
it in ◀◀ or ▶▶ direction to set the selected item.
3.
Press the [MENU] button shortly to exit the image play setting screen.