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• Open either a Levels or Curves adjustment layer. It doesn't matter which.
• Find the three eyedropper icons for Black, Gray and White, like in the image below. (I have an old version of Photoshop, so yours may look different from mine.)
• Select the white eyedropper and click it onto an area of your image that should be white. The spot that you click will then be set to white (255, 255, 255) and the rest of the image will adjust accordingly.
• If you want a different setting than (255, 255, 255) for all of your photos, then manually adjust each of the individual color channels (R, G, B) to the white setting of your choice. Open the flyout menu and save your preset values. That saved preset can then be used on all subsequent images.

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Usually, both the Black and White points are adjusted together (and sometimes the Gray point if the image has a color cast). See tutorial.

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