A vignette effect can help you focus the viewer’s attention on the center of the image by darkening the corners of it. In this video I will show you 3 ways of creating the vignette effect using the Lens Correction tool, the layer mask, and using selections. Enjoy
Adjustments are used to change the colors and contrast of your image. In this tutorial I will show you the benefits of using adjustment layers and show you a few of the most common ones like Hue/Saturation, Color Balance or Levels and Curves.
More beginner tutorials here: http://www.psdbox.com/category/beginners-serie/
Learn how to work non destructively with layer masks.
Landscape image: http://www.sxc.hu/browse.phtml?f=view&id=1086684
Sky image: http://www.sxc.hu/browse.phtml?f=view&id=108861