You should look in your PhotoShop Image menu>Adjustments>Curves...
the curves dialog is dealing with the high and low end color/light values.

When the dialog box opens
By setting anchors on the diagonal line between the center mark and using Subtle ajdustments(up and down) you will be able to fine tune your look. It will also fix your edges.

If you lose some color, then use the same menu and go down to "Selective Color" and bring back what you lost.

I hope this helps.

Max_glass