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Typically, you'll at least want to rough out a selection with the standard selection tools before entering the quick mask mode. Then you can concentrate on refining and modifying your selection inside the quick mask, rather than having to create the selection from scratch. (Naturally, this is only a rule of thumb. I violate the rule several times throughout this chapter, but only because the quick mask mode and I are such tight friends.)
To enter the quick mask mode, click the quick mask mode icon in the toolbox, as I've done in Figure 97. Or press Q. Starting with the same selection I used on the sculpted head in the previous steps section (I inversed the selection yet again so that the background was selected), I pressed Q and got the image shown in Figure 9-7. The head receives the mask because it is not selected. (In Figure 9-7, the mask appears as a light gray coating; on your color screen, the mask appears in red.) The area
Figure 9-7: Click the quick mask mode icon to instruct Photoshop to express the selection temporarily as a grayscale image.
Notice that the selection outline disappears when you enter the quick mask mode. This happens because the outline temporarily ceases to exist. Any operations you apply affect the mask itself and leave the underlying image untouched. When you click the marching ants mode icon (to the left of the
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Part III: Selections, Masks, and Filters
quick mask mode icon) or press Q, Photoshop converts the mask back to a selection outline and again enables you to edit the image.Note
If you click the quick mask mode icon and nothing changes on screen, your computer isn't broken; you simply didn't select anything before you entered the quick mask mode. When nothing is selected, Photoshop makes the entire image open for editing. In other words, everything's selected. (Only a smattering of commands under the Edit, Layer, and Select menus require something to be selected before they work.) If everything is selected, the mask is white; therefore, the quick mask overlay is transparent and you don't see any difference on screen. This is another reason why it's better to select something before you enter the quick mask mode you get an immediate sense you're accomplishing something.
Also, Photoshop enables you to specify whether you want the red mask coating to cover selected areas or deselected areas. For information on how to change this setting, see "Changing the red coating," which is the very next section.
In the quick mask mode, you can edit the mask in the following ways:
Subtracting from a selection: Paint with black to add red coating and, thus, deselect areas of the image. This means you can selectively protect portions of your image by merely painting over them. Adding to a selection: Paint with white to remove red coating and, thus, add to the selection outline, as demonstrated in the left half of Figure 9-8. You can use the eraser tool to whittle away at the masked area (assuming the background color is set to white). Or you can swap the foreground and
Figure 9-8: I painted in white with a soft-edged brush to enlarge the selected area (left). After switching out of the quick mask mode, I went a little crazy with the brush and smudge tools (right). Adding feathered selections: If you paint with a shade of gray, you add feathered selections. You also can feather an outline by painting with black or white with a soft brush shape, as shown in the left image in Figure 9-8. Here, I'm painting in white with a soft-edged brush, adding a nice feathered edge to the top of the selection. Then after re-entering the world of the marching ants, a little more painting and smudging creates the image on the right in Figure 9-8.
Cloning selection outlines: If you have a selection outline that you want to repeat in several locations throughout the image, the quick mask is your friend. Select the transparent area with one of the standard selection tools, press and hold Ctrl+Alt (z -Option on the Mac), and drag the selection to a new location in the image, as shown in Figure 9-9. Although I use the rectangular marquee tool in the figure, the magic wand tool also works well for this purpose. To select an antialiased selection outline with the wand tool, set the Tolerance value to about 10 and be sure the Anti-aliased check box is active. Then click inside the selection. It's that easy.
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287 Photoshop CS Bible @Team LiB
Figure 9-9: To clone the eye sockets selection, I marquee- dragged around it. Then I pressed Ctrl+Alt (z -Option on the Mac) and dragged it first to the top, and then to the bottom (left). This enabled me to switch out of the quick mask mode and paint details into the new eye sockets (right).
Transforming selection outlines: You can scale or rotate a selection independently of the image, just as you can with the Transform Selection command (covered in Chapter 8). Enter the quick mask mode, select the mask using one of the standard selection tools, and choose Edit ® Free Transform or press Ctrl+T (z -T on the Mac). (See Chapter 12 for more information on Free Transform and related commands.)