Dust, Light Scratch, and Stain Removal - Beginning Photo Retouching and Restoration Using GIMP - page 145

5. In the two large shadow areas in the hair, use the same method of mass dust

removal as you did in the previous tutorial (when removing dust from the sky
area). The only difference here is that you'll set the layer's blend mode to Darken
only, because there are light dust specks against a dark background (Figure 6-11 ).

Figure 6-11. Removing the light dust specks by selecting the Darken only blend mode