1 Choose Filter > Noise > Dust & Scratches.
2 If necessary, adjust the preview zoom ratio until the area containing noise is visible.
3 Drag the Threshold slider left to 0 to turn off the value, so that all pixels in the selection or image can be examined.
The Threshold determines how different the pixels' values should be before they are eliminated.
Note: The Threshold slider gives greater control for values between 0 and 128—the most common range for images—than for values between 128 and 255.
4 Drag the Radius slider left or right, or enter a value in the text box from 1 to 16 pixels. The radius determines how far the filter searches for differences among pixels.
Adjusting the radius makes the image blurry. Stop at the smallest value that eliminates the defects.
5 Increase the threshold gradually by entering a value or by dragging the slider to the highest value possible that eliminates defects.
Median Reduces noise in an image by blending the brightness of pixels within a selection. The filter searches the radius of a pixel selection for pixels of similar brightness, discarding pixels that differ too much from adjacent pixels, and replaces the center pixel with the median brightness value of the searched pixels. This filter is useful for eliminating or reducing the effect of motion on an image.
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