Generally, I only use this filter on the picture parts where there is little detail such as the background in the example. Next increase the threshold value gradually until the texture of the image is restored and the defect is still removed (see Figure 33.2). Find, and set, the lowest radius value where the mark is removed. Use the zoom controls to enlarge the view of the defect. Next use the preview box in the filter dialog to highlight a mark that you want to remove. To find settings that provide a good balance, try adjusting the threshold setting to zero first. Too much filtering and your image will appear blurred, too little and the marks will remain (see Figure 33.1). The settings you choose for this filter are critical if you are to maintain image sharpness whilst removing small marks. The Dust and Scratches filter in Photoshop and Photoshop Elements helps to eliminate these annoying spots by blending or blurring the surrounding pixels to cover the defect. It seems that no matter how careful I am, my scanned images always contain a few dust marks. More than enhancing existing detail, these techniques are designed to change the information in your pictures and so are usually considered editing techniques. Now let's throw a few more techniques into the editing arena for good measure.
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