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Chapter 12. Sharpening > Dust & Scratches

Dust & Scratches

The Dust & Scratches filter uses the same technology as the Median filter, but it adds a Threshold setting to determine which shades in your image should be affected by the filter. A setting of zero will allow the filter to apply to the entire image, and will therefore work exactly like the Median filter. Raising the Threshold setting will limit the changes to areas that are similar in brightness. The general idea here is to start with a Threshold of zero so you work on the whole image, and then adjust the Radius setting until the noise in the image is gone. Then, to make sure you lose the absolute minimal amount of true detail, change the Threshold setting to 255 and then use the down arrow key to slowly change that setting until you find the highest number that will rid your image of unwanted noise (Figures 12.13 and 12.14).

Figure 12.13. Using the Dust & Scratches filter with a Radius of 1 and a Threshold of 16 produced the same result on our specks.



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