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verify you have an LG screen
ioreg -lw0 | grep IODisplayEDID | sed "/[^<]*</s///" | xxd -p -r | strings -6
=> LP133WP1-TJA3 Color LCD
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copy file to profiles
sudo cp CustomMacRumors.icc /Library/ColorSync/Profiles/Displays
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open system preferences / displays
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select "color lcd"
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done