Noise variations

Normally, the Add Noise filter adds both lighter and darker pixels to an image. If you prefer, however, you can limit the effect of the filter to strictly lighter or darker pixels. To do so, apply the Add Noise filter, and then apply the Fade command (Ctrl+Shift+F) and select the Lighten or Darken blend mode. Or you can copy the image to a new layer, apply the filter, and merge the filtered image with the underlying original.

Ij-1 Remember, the Fade command now resides on the Edit menu, not the Filter menu.

But everything else about Fade is the same as it was in the past.

Figure 10-39 shows sample applications of lighter and darker noise. After copying the image to a separate layer, I applied the Add Noise filter with an Amount value of 40 percent, and selected Gaussian. To create the upper-left example in the figure, I selected Lighten from the blend mode pop-up menu. To create the right example, I selected the Darken mode. In each case, I added a layer of strictly lighter or darker noise while at the same time retaining the clarity of the original image.

To achieve the streaked noise effects in the bottom example of Figure 10-39, I applied Motion Blur and Unsharp Mask to the layered images. Inside the Motion Blur dialog box, I set the Angle value to -30 degrees and the Distance to 30 pixels. Then I applied Unsharp Mask with an Amount value of 200 percent and a Radius of 1. Naturally, the Threshold value was 0.

Motion Blur, Lighten Motion Blur, Darken

Figure 10-39: You can limit the Add Noise filter to strictly lighter (left) or darker (right) noise by applying the filter to a layered clone. To create the rainy and scraped effects (bottom examples), I applied Motion Blur and Unsharp Mask to the noise layers.

Motion Blur, Lighten Motion Blur, Darken

Figure 10-39: You can limit the Add Noise filter to strictly lighter (left) or darker (right) noise by applying the filter to a layered clone. To create the rainy and scraped effects (bottom examples), I applied Motion Blur and Unsharp Mask to the noise layers.

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