Tolerance for Quick Selection tool

The logic in the Quick Selection tool is different enough from the Magic Wand that a numerical Tolerance option probably doesn't apply, but there is a way to make it select less. Do you know about the Option key trick? If clicking the Quick Selection tool selected too much, Option-click the Quick Selection tool on the areas you didn't want to select. That teaches the Quick Selection tool not to select similar areas again. Having done that, the next time you click the Quick Selection tool it should be more accurate. By alternately clicking the areas you want, and Option-clicking the areas you don't want, you progressively narrow down your selection until you get the selection you like. Then you can use the Refine Edge button to tune the edge.

In other words, instead of fiddling with Tolerance numbers, you can teach the tool by clicking.