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Adobe's Photoshop software is a very powerful image editing program that is by far the market leader for editing image files. I use Photoshop extensively when creating, and editing images for the web sites that I design. Almost all professional photographers and printers also use Photoshop to create all of the wonderful images that appear in magazines, billboards, and even on television. I am not the best artist in the world, but with Photoshop I have enough power to create brilliant images with tools that are built-in to the software. The coolest thing about Photoshop is that even as powerful as it is out of the box, there are many different plug-ins to make Photoshop even more powerful. The Photoshop plug-ins can be grouped into a few major categories which include 3D, color management, digital asset management, photographic, retouching, and special effects.

Normally our eyes compensate for lighting conditions with different color temperatures. A digital camera needs to find a reference point which represents white. It will then calculate all the other colors based on this white point. For instance, if a halogen light illuminates a white wall, the wall will have a yellow cast, while in fact it should be white. So if the camera knows the wall is supposed to be white, it will then compensate all the other colors in the scene accordingly. Most digital cameras feature automatic white balance whereby the camera looks at the overall color of the image and calculates the best-fit white balance. However these systems are often fooled especially if the scene is dominated by one color, say green, or if there is no natural white present in the scene. Most digital cameras also allow you to choose a white balance manually, typically sunlight, cloudy, fluorescent, incandescent etc. Prosumer and SLR digital cameras allow you to define your own white balance reference. Before making the actual shot, you can focus at an area in the scene which should be white or neutral gray, or at a white or gray target card. The camera will then use this reference when making the actual shot.