Specifications

CHAPTER 9 Video and Sound
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Changing Screen Color Depth in the Virtual Machine
If you choose to change the color settings in the guest operating system, the
approach you use depends on the combination of host and guest you are using.
Follow the normal process for changing screen colors in your guest operating system.
In a Windows guest, the Display Properties control panel offers only those settings
that are supported.
In a Linux or FreeBSD guest, you must change the color depth before you start the X
server, or restart the X server after you make the changes.