In many Photoshop 101 lessons they say that any adjustment to a photo can actually be achieved via a manipulation on the curves tool. While this may seem true, it is not really trivial to understand how each of the adjustment layers changes the curves. In fact some of the adjustment layers (like photo filters) don’t seem to be curves related at all.
Edmon Amiraghyan shared a very interesting PSD file with retouching academy that interactively deconstructs any adjustment applied to a file into its curves manipulation twin brother.
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