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Well, actually, I almost never use the fit-on-screen view because it's too arbitrary. Photoshop does the best job of previewing an image when you can see all pixels ? that is, at 100-percent view size. Short of that, you want the screen pixels to divide evenly into the image pixels. This means view sizes such as 50 percent or 25 percent, but not 75 percent or 66.7 percent. And you never know what the zoom ratio is going to be with the fit-on-screen view.Print size
You can switch to yet another predefined view size by choosing View ® Print Size. This command
theoretically displays the image on screen at the size it will print. (You set the print size using Image ® Image Size, as I explain in Chapter 3.) When the zoom tool is active, you also can click the Print Size button in the Options bar to turn on the print-size view.
In practice, "print-size" view isn't particularly reliable. Photoshop assumes that your monitor displays exactly 72 pixels per inch, even on the PC, where the accepted screen resolution is 96 pixels per inch. But it's all complete nonsense, whatever the assumption. Monitor resolutions vary all over the map.
And high-end monitors let you change screen resolutions without Photoshop even noticing.
The long and the short of it is this: Don't expect to hold up your printed image and have it exactly match the print-size view on screen. It's a rough approximation, designed to show you how the image will look when imported into InDesign, QuarkXPress, PageMaker, or some other publishing program nothing more. The zoom tool
Obviously, the aforementioned zoom ratios aren't the only ones available to you. You can zoom in as
close as 1,600 percent and zoom out to 0.2 percent.
The most straightforward way to zoom in and out of your image is to use the zoom tool:
Click in the image window with the zoom tool to magnify the image in preset increments from 33.33 percent to 50 to 66.67 to 100 to 200 and so on. Photoshop centers the zoomed view at the point where you clicked (or comes as close as possible).
Alt-click (Win) or Option-click (Mac) with the zoom tool to reduce the image incrementally 200 to 100 to 66.67 to 50 to 33.33 and so on. Again, Photoshop tries to center the new view on the click point.
Tip Drag with the zoom tool to draw a rectangular marquee around the portion of the image you want to magnify. Photoshop magnifies the image so the marqueed area fits just inside the image window. (If the horizontal and vertical proportions of the marquee do not match those of your screen for example, if you draw a tall, thin marquee or a really short, wide one Photoshop favors the smaller of the two possible zoom ratios to avoid hiding any detail inside the marquee.)
If you want Photoshop to resize the window when you click with the zoom tool, select the Resize Windows to Fit check box in the Options bar. The check box appears only when the zoom tool is the active tool.
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41 Photoshop CS Bible @Team LiB
Turn off the Ignore Palettes check box in the Options bar if you want Photoshop to stop resizing the window when the window bumps up against a palette anchored against the side of the program window. Turn the option on to resize the window regardless of the palettes. The palettes then float over the resized window.
Photeshop If you have multiple image windows open, you can control the zoom ratio on all of them at the same time. Simply Shift-click with the zoom tool in any image window. Alternatively, you can eliminate the need for the Shift key by turning on the Zoom All Windows check box in the Options bar.Tip
To access the zoom tool temporarily when some other tool is selected, press and hold the Ctrl (Win) or z (Mac) and spacebar keys. Release both keys to return control of the cursor to the selected tool. To access the zoom out cursor, press Alt (Win) or Option (Mac) with the spacebar. These keyboard equivalents work from inside many dialog boxes, enabling you to modify the view of an image while applying a filter or color correction. The zoom commands
You can also zoom in and out using the following commands and keyboard shortcuts:
Choose View ® Zoom In or press Ctrl+plus (+) (z -plus on the Mac) to zoom in. This command works exactly like clicking with the zoom tool except you can't specify the center of the new view size. Photoshop merely centers the zoom in keeping with the previous view size.
Choose View ® Zoom Out or press Ctrl+minus (?) (z -minus on the Mac) to zoom out.Tip The General panel of the Preferences dialog box (that's Ctrl+K on the PC and z -K on the Mac) includes an option called Zoom Resizes Windows. If you select this option, Photoshop resizes the image window when you use the Zoom commands. To override the setting temporarily, press Alt (Win) or Option (Mac) as you press the keyboard shortcut or select the menu command. Similarly, if you deselect the option in the Preferences dialog box, you can add Alt or Option to turn window-zooming on temporarily.