Special Effects - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 224

Figure 4.17
6. Click OK to close the Filter Gallery, and then press D to set the foreground and
background colors to their default of black and white. Press X so that white be-
comes the foreground color. Choose the Gradient tool from the toolbar and, in the
options at the top of the screen, select the Foreground to Transparent from the
Gradient Picker, and the Linear gradient as in Figure 4.18 .
Figure 4.18
7. Drag inward from each side (left, right, top, and bottom) and from the corner of the
document several times. This will cover the debris that is too close to the edge and
ensure that there are no straight lines ( Figure 4.19 ). Then go to Image > Adjust-
ments > Levels, click the Black Point sampler icon ( Figure 4.20 ) . Zoom in on the
document and click any of the debris shapes (this darkens them all so that they
stand out more). Click OK to close the Levels Adjustment dialog.