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Adjust the Image Color Depth
The color depth of the displayed image refers to how many bits of information are used to represent the color of each pixel. The more colors that are used, the better the quality of the image, but of course there are other factors that trade off against image quality.
If your video card is capable of displaying higher color depths, you can enable these color depths to get higher quality images. By default, most PCs come with 256-color mode enabled, which is the "standard" of sorts within Windows. The disadvantages of using higher color depths are similar to those of using higher resolutions: slower video performance; a potentially lower refresh rate which may cause flicker on some monitors, and less support for higher resolutions than if you used 256-color mode.
There are several ways to change the color depth: