Photoshop Tutorials

Image Stacking in Photoshop for greater depth of field

Sites with lots of resources

• Adobe

Specific Skills

Blend If (Photoshop CS)

You can use the Blend If feature of photoshop to replace an area of uniform color.
Here are a couple of tutorials on it:

• Replace Sky (layer masks)
• Sold Real Estate Sky Replacement Tutorial Just Became Easier