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Use Pixel Doubling (off): When you're editing huge images on a less-than-robust computer, this option can help speed up operations but not by much. When you select the option, Photoshop displays selected areas using a low-resolution proxy. This option goes into effect with selections and while
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Part I: Welcome to Photoshop
Painting Cursors (Brush Size): When you use a paint or edit tool, Photoshop can display one of three cursors. The Standard cursor looks like a paintbrush, an airbrush, a finger, or whatever tool you are using. These cursors are great if you have problems keeping track of what tool you selected, but otherwise they border on childish.
The Precise and Brush Size options are more functional. The Precise option displays a cross-shaped cursor called a crosshair regardless of which tool is active. The crosshair is great because it prevents the cursor from blocking your view as you edit. Meanwhile, the Brush Size option shows the actual size and shape of the active brush in the Brushes palette. The Brush Size option is the default setting in Photoshop CS, and that's a good thing. Most artists prefer this final setting to the others because it comes the closest to showing the cursor the way it really is.Tip
When Standard or Brush Size is selected, you can access the crosshair cursor by pressing the Caps Lock key. When Precise is selected from the Painting Cursors options, pressing Caps Lock displays the brush size.
Other Cursors (Standard): Again, you can select Standard to get the regular cursors or Precise to get crosshairs. I prefer to leave this option set to Standard because you can easily access the crosshair cursor by pressing Caps Lock. The Precise option locks you into the crosshair whether or not you like it. Transparency & Gamut
Press Ctrl+4 (z -4 on the Mac) to switch to the Transparency & Gamut panel shown in Figure 2-21. The options in this panel change how Photoshop displays two conceptual items transparent space behind layers and RGB colors that can't be expressed in CMYK
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Figure 2-21: The options in this panel affect how Photoshop represents transparency and out-ofgamut colors. For the most part, you just want to select colors that you don't often see in your images. The options are arranged into two groups Transparency Settings and Gamut Warning as explained in the following sections.Transparency Settings
Just as the Earth spins around in empty space, a Photoshop image rests on a layer of absolute transparency. By default, Photoshop represents this transparency as a gray checkerboard pattern. (What better way to demonstrate nothingness? I might have preferred a few lines from a Jean-Paul Sartre play, but no matter.) You may get a brief glimpse of this checkerboard when you first open an image or switch to Photoshop from another application.
When you view a layer independently of others, Photoshop fills the see-through portions of the layer with the checkerboard. So having the checkerboard stand out from the layer itself is essential. You can customize the size of the checkers and the color of the squares using the Grid Size and Grid Colors pop-up menus. You can also click the color swatches to define your own colors.Tip To lift colors from the image window, move your cursor outside the Preferences dialog box to get the eyedropper. Click a color to change the color of the white checkers; Alt-click (Win) or Option-click (Mac) to change the gray ones.
If you own a TrueVision NuVista+ board or some other 32-bit device that enables chroma keying, you can select the Use Video Alpha check box to view a television signal in the transparent area behind a layer. Unless you work in video production, you needn't worry about this option.Gamut Warning If Photoshop can display a color on screen but can't accurately print the color, the color is said to be out of gamut . You can choose View ® Gamut Warning to coat all out-of-gamut colors with gray. I'm
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53 Photoshop CS Bible @Team LiB
not a big fan of this command View ® Proof Colors (Ctrl+Y or z -Y) is much more useful but if you use View ® Gamut Warning, you don't have to accept gray as the out-of-gamut coating. Change the color by clicking the Gamut Warning Color swatch and lower the Opacity value to request a translucent coating. Units & Rulers
The Units & Rulers panel is the fifth panel in the Preferences dialog box; hence, you reach the panel by pressing Ctrl+5 (z -5 on the Mac). Shown in Figure 2-22, this panel offers options that enable you to change the predominant system of measurement used throughout the
Figure 2-22: Go to the Units & Rulers panel to change the column and pica settings and set the unit of measurement. I prefer to use Pixels as opposed to Inches.Tip
Whenever the rulers are visible, the Units & Rulers panel is only a double-click away. Choose View ® Rulers (Ctrl+R or z -R) to see the rulers on screen and then double-click either the horizontal or vertical ruler.Rulers