Canon EOS REBEL T1 i/EOS 500D Instruction Manual page 147

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Image Playback
This chapter explains features related to viewing photos
and movies, going into more detail than in Chapter 2
"Basic Shooting and Image Playback" which explained
the playback procedure. Here you will learn how to
playback and erase photos and movies with the camera
and viewing them on a TV set.
About images taken with another camera:
The camera might not be able to properly display images captured
with a different camera or edited with a computer or whose file name
was changed.