Photoshop Collage Techniques
As Haun points out, a collage combines several different elements and  materials, and a montage combines several integrated photos.Photoshop Collage  Techniquesis an excellent guide to creating both types of artwork in Photoshop 4.0  for Windows and Macintosh. This four-color book explains smart ways to use Adobe's  color options, layers, and masking features to create interesting compositions.Much of the advice relates to creating vignettes, fractured effects, shadows, textures, and  special effects. There's also a useful chapter on Web graphics and a discussion of  copyright issues to be aware of when acquiring artwork for your collages. The chapter,  "The Visual Clues of Photomontage," discusses design concepts such  as consistent lighting, color balance, and atmospheric and linear perspective. This is an  outstanding book for Photoshop users who are ready to move on to sophisticated collages  and similar compositions.