The GD11FVRSD Series of Freeview recorders are capable of taking a screenshot by pressing the 0 button.
As the image is stored on the HDD this camera icon will display in the centre of the screen:
These captured images are available to view in the Library by switching views with the INFO (V/A/P)* button on the remote control.
*V/A/P stands for Video, Audio and Picture.
(V) VIDEO is where your recorded television programmes are stored.
(A) AUDIO is where your recorded radio programmes are stored.
(P) PICTURES is where your screen shots are stored.