If you're working with PhotoShop, here is a link to a series of Actions to help you adjust color, density and contrast quickly, that avoid having to use Curves or Levels.

You're welcome to download (right-click or control-click and save linked file) the Actions.

If the file downloads as Silvano1.atn.html, rename the file to Silvano1.atn .

Move the file to your Adobe PhotoShop folder (in the Actions Folder which is in the Presets Folder).

In PhotoShop Go to Window > Actions and Load the Actions by pointing to the Folder where they're stored.