How can I white balance an image based on part of the image I know is white?

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Matthew Parson
Matthew Parson 2017-6-2
回答： Mahmoud Afifi 2019-8-12
I have this image, and I know that the top left of it should be white. Is there a way for me to select that part of the image and say it's white, and then adjust the color of the rest of the image to match?
What I have so far is using roipoly to select the part of the image that I want, but I have no idea where to go from there in regards to color correction.

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Mahmoud Afifi
Mahmoud Afifi 2019-8-12

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