Shades of grey

Is there any pre-settings for the shades of grey as I use Photoshop to design a piece or is just relative to the different shades on the piece itself? Thanks

Black is full depth.
White is no cut.

Shades of gray in between affect the cut depth.

Take your material depth divide by 255 and each shade of gray changes the cut depth by that much. So if you have a 0.5” material, each shade is 0.002” of depth difference.

At least that’s the way it has worked for me when I’ve messed around with it.