{mosgoogle}3) Correct Depth of Field. Images that have one object or area in focus and then behind that an object out of focus, and then behind that another object in focus will look very odd and be completely unbelievable. Like perspective, combining images shot with differing depth of field will require you to adjust the focus of the elements to correct the Depth of Field. One draw back, while it is possible to soften objects to make them appear out of focus or have short depth of field, it is next to impossible to sharpen soft objects to make them appear to be in focus. Depth of Field problems are one of the most common mistakes made in Photoshop compositions.

4) Direction of Light. When montaging images it is important to combine images shot with the same lighting conditions. The play of light on an object creates a series of shadows that have a specific directional play depending on where the light source was in relation to the object. If you montage together two images with differing light sources the image will look unreal and undesirable.

5) Colour cast. All images have a colour cast otherwise know as WHITE BALANCE, this is the HUE of the white areas. Also know as the colour temperature of an image. Be careful to adjust the colour cast of montaged images so that the white areas look the same, doing otherwise will render your images unreal and undesirable.

The human eye has an amazing ability to spot subtle changes in what it considers normal. Stare at a picture of a pink banana, after a short while the banana will start to appear yellow, but you will still have the feeling that something is not right. This also applies equally to Colour, Focus, Perspective and Light Direction. When creating montage images in Photoshop it is important to watch for mistakes in these areas as you will want to have your images look as real as possible and thus as desirable or aesthetically pleasing as possible. I have seen far too many images used in big advertising campaigns with blatant disregard for these basic principles. Done right Photoshop can create compelling compositions; done wrong and it just looks, well… wrong!

Sean David Baylis is a professional photographer who has been using the popular photo editing program Adobe Photoshop since 1994 version 2.5. He is considered by many an expert user and is called on to retouch major national ad campaigns and art books in addition to his own commercial and editorial work. Examples of Sean’s work can be seen at http://www.sdbphoto.com.