BenQ W5000 User Manual - Page 30

W20000-en.book Page 30 Monday, October 22, 2007 3:35 PM English Selecting the aspect ratio The "aspect ratio" is the ratio of the image width to the image height. Digital TV is usually in 16:9 ratio, which is the default for this projector, and most analog TV signals and DVDs are in 4:3 ratio. With the advent of digital signal processing, digital display devices like this projector can dynamically stretch and scale the image output to a different aspect than that of the image input source. Images can be stretched in a linear manner so the whole of the image is stretched equally, or non-linearly, which distorts the image. To change the projected picture ratio (no matter what aspect the source is): • Using the remote control Press one of the aspect ratio buttons to suit the format of the video signal and your display requirements. • Using the OSD menu 1. Press MENU and then press / until the Display menu is highlighted. Display 2. Press to highlight Aspect Ratio. Aspect Ratio Anamorphic Keystone 3. Press / to select an aspect ratio to suit the format of the video signal Position Overscan Adjustment 0 and your display requirements. PIP PC & Component YPbPr Tuning About the aspect ratio 1. Anamorphic (ANA): Scales an image so that it is displayed in the center of the screen with a 16:9 aspect ratio. This setting stretches and resizes linearly, except that it treats the vertical and horizontal dimensions independently. It stretches the height of the source image until it reaches the full projected height, and stretches the width of the source image until it reaches the full projected width. This may alter the projected aspect, depending upon the original aspect of the source image. Anamorphic is most suitable for images which are already in a 16:9 aspect, like high definition TV, as it displays them without aspect alteration. 2. 4:3: Scales a picture so that it is displayed in the center of the screen with a 4:3 aspect ratio. This is most suitable for 4:3 pictures like computer monitors, standard definition TV and 4:3 aspect DVD movies, as it displays them without aspect alteration. 3. Letter Box (LB): Scales a picture to fit the projector's native resolution in its horizontal width and resize the picture's height to the 3/4 of the projection width. This may produce a picture greater in height than can be displayed, so part of the picture is lost (not displayed) along the top and bottom edges of the projection. This is suitable for the display of movies which are presented in letter box format (with black bars on the top and bottom). S-Video 16:9 picture 4:3 picture 16:9 picture Letter Box format picture 4. Wide: Stretches the picture horizontally in a non-linear manner, that is, the edges of the picture are stretched more than the center of the picture to prevent distortion of the central part of the picture. This is suitable for occasions where you want to stretch the width of a 4:3 aspect picture to 4:3 picture the width of a 16:9 aspect screen. It does not alter the height. Some widescreen movies have been produced with their width squashed down to the width of a 4:3 aspect, and are best viewed when restretched back to their original width using this setting. EXIT Back 30 Using the projector