Resolution of my macbook changed to 256

I was connected via bluetooth to another mac. When the other mac tried to send me a file via blue tooth the resolution of my computer changed to 256. I have tried to do many things to change it back and nothing works. Anyone has idea of what is happening?

Goto System Preferences/Displays/Display tab and under Colors change it in the dropdown from 256 to Millions. That should change it back.

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Resolution of my macbook changed to 256

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