Canon Powershot A590 IS User Manual page 151

149
The video output signal can be switched (NTSC or PAL) to
accommodate different regional standards (p. 53). The
default setting varies between regions.
- NTSC: Japan, U.S.A., Canada, Taiwan and others
- PAL: Europe, Asia (excluding Taiwan), Oceania and others
If the video system is set incorrectly, the camera output may
not display properly.