It all started with optical filters. For a long time, photographers have been attaching filters to their lenses so that they could have more control on the shots they capture. With the help of these filters, they can make changes to their images and create better photos. There are many types of optical filters, each one for a specific use. Some examples of them are color-correcting filters, infrared filters, neutral density filters, and many more. Once digital photography started, digital filters were created. A digital filter is basically a generic term for referring to a special mathematical operation applied to an image. Similar to optical filters, you can apply many operations to a digital image. Each one of them can produce very different results. Some of these operations are used to increase or decrease the sharpness of the image; others are used to remove unwanted noise in the image. There are many other usages, including artistic effects. A generic term that is commonly used to describe all of these operations is filters. In this chapter, I will show you some of the filters most commonly used in digital photography. The filters that I will show you are Blur, Sharpness, Noise Reduction, and a couple of Artistic filters. But first, I will show you how to select a specific region of the image so that you can apply the filter to it instead of the entire image.


Selection Tool Infinite Impulse Response Left Image Motion Blur Digital Photography 
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© Sebastian Montabone 2010

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