How to Use an Inverted Layer for Color Correction

From the f64 Academy:

So what if I told you there was a second dimension of data in your photos that can help you make the most accurate color correction ever? You probably wouldn't believe me because it is a bold statement and you might not be as into Sci-Fi as I am. However, this other dimension is not in a galaxy far far away as it sounds, it is as simple as inverting your photo to access it.

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