Canon POWERSHOT SD770IS DIGITAL ELPH User Manual page 119

117
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[_] he Defined Playback mode will be canceled under the
following circumstances.
- Changing categories (while using My Category to define
images)
- When selecting images in a range
- When displaying images not supported in defined playback
- When newly saving images that have effects added or are
edited
- When images are deleted using [Erase] from the [] menu