Chapter 9. Adjustments
This chapter covers many methods for adjusting an image’s light and dark values. Using commands on the Image > Adjustments submenu 
, you can make simple adjustments, like Invert a layer to make it look like a film negative, or Posterize it to restrict its luminosity levels to a specified number. Or you can make more precise lightness or contrast adjustments to a layer’s highlights, midtones, or shadows using such features as Levels or Curves. You can also darken smaller areas by hand using the Burn tool, or lighten areas using the Dodge tool.
The Image>Adjustments submenu
Adjustment basics
Here are a few pointers for applying ...
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