Sony DCR-TRV39 - Manual (Page 69)

3-2 Thumbnails
Thumbnails are small graphic representations of files which have been added to a particular album.
Thumbnails for a selected album are displayed in the 'thumbnail list window.'
Movie file thumbnails
The graphic representation, or thumbnail image,
consists of the first frame of the movie.
The title of the movie is shown here.
This is the icon used for movie files.
Sound file thumbnails
This is the ImageMixer thumbnail image used for
sound media.
The title of the sound media is shown here.
This is the icon used for sound media.
Still picture file thumbnails