Instructions
Use your controller joystick to scroll through the PS3's home screen until you get to the "Settings" option. Press the "X" button to select "Settings."
Highlight the "Display Settings" option and then click the "X" button.
Click "Video Output Settings."
Click on the appropriate video output selection for your TV. For instance, if you use an HDMI cable on your TV, select the "HDMI" output.
Choose the resolution from the menu. Choices will include "1080p/1080i," "720p," and "576p." Select one by pressing the "X" button.
Click the "Change" icon to change the resolution.