Canon 970 IS - Manual (Page 140)

138
Transition Effects
You can select the transition effect used when one image is replaced
by another.
No transition effect.
The new image gradually brightens as it moves upward from the
bottom.
The new image first appears in a cross shape and gradually expands
to display the full image.
Portions of the new image move horizontally, then the image expands
to display the full image.
In single image playback mode, you can start a slide show from
the current image displayed by holding the FUNC./SET button
while you press the
button. Please note that if you do
this while the last image shot is displayed, the slide show will
start from the first image using the same date.