Optoma DS550 User Manual page 26

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Brightness
Brighten or darken the image.
Contrast
Set the difference between light and dark areas.
Color Settings
Adjust the color temperature. At higher temperature the screen looks colder;
at lower temperature, the screen looks warmer. If you select "User", then you
can change the intensity of each of 3 color (Red, Green, Blue) to customize
user color temperature.
Keystone
Manually correct distorted images resulting from an angled projection.
Zoom
Zoom in and out the images.
Aspect Ratio
Use this function to choose your desired aspect ratio.
For SVGA models:
4:3 The input source will be scaled to 800 x 600.
16:9-I: The input source will be scaled to 800 x 450.
16:9-II: The input source will be scaled to 800 x 480 (show 800 x 600).
For XGA models:
4:3 The input source will be scaled to 1024 x 768.
16:9-I: The input source will be scaled to 1024 x 576.
16:9-II: The input source will be scaled to 1024 x 614 (show 1024 x 768).
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