Dark to Light, Light to Dark in Photoshop

You can change the tone of an image with Levels in Photoshop of course, but you can also do it in another way, which will give a better effect. You can change an image with a dark tone to light and vice-versa.

An image with a dark tone.

Changed to a light tone.

An image with a light tone.

Changed to a darker tone.

The photoshop tutorial is here 

Other photoshop tutorials are here