How to change the contrast of a photo in swift playground for iPad?

I would like to know how to be able to get it so when you press a button, it will up the contrast by 5, and so on. This is for Swift Playgrounds iPad.

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Can you elaborate on what you mean by “photo” here? Where does this photo come from? And, after changing the contrast, do you plan to save the changed photo somewhere? Or just display it?

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