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

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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 el 12 de Ag. de 2019


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