Brush Off Noise
Image noise often only affects certain parts of an image, as our example in Figure 8-110 shows. To clarify the effect we are trying to achieve, we have reproduced the noisy image detail enlarged and slightly brighter in Figure 8-111. We will use a layer mask to selectively remove this noise.
Figure 8-110. This image displays heavy noise in the shadow area indicated by the dotted line.
First, we copy the background layer (either by dragging it to the ...