Photoshop

Apply the Dust And Scratches filter

  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 value determines how dissimilar the pixels 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 value determines the size of the area searched for dissimilar pixels.

    Increasing the radius blurs the image. Use the smallest value that eliminates the defects.

  5. Increase the threshold gradually by entering a value or by dragging the slider to the highest possible value that eliminates defects.