Lost colour on s3

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Hello Tina, welcome to the forums at Android Central!
As belodion suggested, it could be the greyscale feature, check also the battery saving features just in case.
 
Sam_Gs7 : Welcome you to Android central forums
and with the reported colour issue in your device

could be Due to the reason stated by belodion
but wait for B. Diddy may got a solution..
@tina you've an oxon avatar, who agree with that.?
 
I moved this from the Intros forum to the Tab S3 forum. I agree with the above, it's probably either a power-saving mode or a greyscale mode.