Hey guys, quick question. I'm checking out Coro's psd files from the exclusive content thread, and he seemingly likes to adjust the levels/saturation/colour etc. of the image on a few layers. These particular layers have icons that suggest their purpose (check attached), what's the difference between these and regular layers (for lack of a better term)? Or better yet how do you go about creating a new layer just for the adjustment? I dunno, I'm stupid.