You also can use gradations in the quick mask mode to fade the outcomes of filters and other automated special effects. For example, I wanted to apply a filter around the edges of the Lincoln colossus that appears in Figure 9-15. I began by deselecting everything in the image (Ctrl+D) and switching to the quick mask mode. Then I selected the Gradient tool, selected the linear gradient style icon on the Options bar, and selected the Foreground to Transparent gradient from the Gradient dropdown palette. I also selected the Transparency check box on the Options bar.
I pressed D to make the foreground color black and the background color white. Then I dragged with the linear gradient tool from each of the four edges of the image inward to create a series of short gradations that trace around the boundaries of the image, as shown in Figure 9-16. (As you can see, I've hidden the image so that you see the mask in black and white.) Because I've selected the Foreground to Transparent option, Photoshop adds each gradation to the previous gradation.
To jumble the pixels in the mask, I applied Filter ^ Noise ^ Add Noise with an Amount value of 24. You see the effect in Figure 9-16.
Tip The only problem is that I want to select the outside of the image, not the inside.
So I need the edges to appear black and the inside to appear white, the opposite of jF what you see in Figure 9-16. No problem. All I do is press Ctrl+I (Image Adjust Invert) to invert the image. Inverting inside the quick mask mode produces the same effect as applying Select ^ Inverse to a selection.
Finally, I switched back to the marching ants mode by again pressing Q. Then I applied Filter ^ Render ^ Clouds to get the atmospheric effect you see in Figure 9-17. Yes, he's Abe the Illusionist — Lincoln as you've never seen him before! Once he gets to Vegas, he'll wipe the floor with David Copperfield.
Tip Notice the corners in the mask in Figure 9 16? These corners are rounded, but you can achieve all kinds of corner effects with the linear gradient tool. For harsher cor * ners, select the Foreground to Background gradient and select Lighten from the Mode pop-up menu on the Options bar. For some really unusual corner treatments, try out the Difference and Exclusion brush modes. Wild stuff.
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