Correct The Exposure: Shadows & Highlights Filter

Step 2: Run Shadows & Highlights Filter

Shadows & Highlights filter does not have the powers of its Photoshop counterpart, but sometimes it may offer you nice results in a very fast manner. I read a lot of critics on the Internet against this filter just because it has not preview facility. My question is: why do you need a preview? Taking in consideration how this filter works, it really makes no sense to have a preview. When you select the Shadows & Highlight filter, the following dialog is activated:

This is tricky. Why?! Because no meter what values you enter for shadows and highlights, the algorithm will do the same processing. Finally you will end up with 2 extra layers, one for shadows and one for highlights, both in overlay mode (this mode works as a multiply for darken zones and as a screen for lighter ones). Changing the value of these 2 sliders affects only the opacity of each layer, which you can of course change later, after running the filter, seeing the results in the image itself.