Pentax Optio T20 - Manual (Page 88)

Playing Back Images, Movies, and Sound Files
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Setting the Interval
Touch [Interval] on the Slideshow screen to set the playback interval.
Select from [3sec], [5sec], [10sec], [20sec], or [30sec] for setting
[Interval].
Touch the icon of the desired duration time to save the setting and return
to the Slideshow screen.
Setting the Screen Effect
Touch [Screen Effect] on the Slideshow screen to set the transition effect
between images. Select from the following effects.
Touch the icon of the desired effect to save the setting and return to the
Slideshow screen.
Setting the Sound Effect
Touch [Sound Effect] on the Slideshow screen to set the sound effect
between images.
Except when the [Screen Effect] is set to Off, you can choose O (On) or
P
(Off) for the sound that is played when one image changes to the next.
Memo
If the screen effect is set to off, then the sound effect will also be set to off.
i Wipe The next image slides over the previous one from left to right.
k Fade
The current image gradually fades out and the next image
fades in.
j Shrink
The image shrinks to a single point and then changes to the
next image.
Off Off No effect