The difference between photos and videos before and after color grading.

Nope. This is highly misleading. As a few commenters point out, the “before” footage is all in Log format, which is for the purpose of allowing a higher dynamic range than a camera can capture normally. This format is not designed for human viewing.

To truly see the effect of color grading, the footage should be viewed in a standard color profile. That’d be the “before.” The after would be the (effects of) grading.

This is an invalid and incorrect comparison. Just goes to show that about 90% of the information and claims on the internet are misleading or wrong.