How to chg Sys Colors (256 to 16bit example)

I have not found an API etc. that can actually change the color palette which will allow you to change the system color resolution.

For example if I wanted to change the system color palette from 256 colors to 16bit.

I have found plenty of API's that change screen resolutiuons or the Border & Background colors:
GetSystemMetrics
ChangeDisplaySettings

Any help would be appreciated.

Doug

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