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Lesson 2. Getting to Know the Work Area > About on-screen display

About on-screen display

Take a look at the status bar, located at the bottom of the document window. Notice that the magazine is tabloid size (11-by-17 inches) and currently appears at 100% magnification on-screen.

The magnification shown in the status bar does not refer to the printed size of the page, but rather to how the page is displayed on-screen. Acrobat determines the on-screen display of a page by treating the page as a 72 ppi (pixels-per-inch) image. For example, if your page has a print size of 2-by-2 inches, Acrobat treats the page as if it were 144 pixels wide and 144 pixels high (72 × 2 = 144). At 100% view, each pixel in the page is represented by 1 screen pixel on your monitor.

How large the page actually appears on-screen depends on your monitor size and your monitor resolution setting. For example, when you increase the resolution of your monitor, you increase the number of screen pixels within the same monitor area. This results in smaller screen pixels and a smaller displayed page, since the number of pixels in the page itself stays constant. The following illustration shows the variation among 100% displays of the same page on different monitors.

Pixel dimensions and monitor resolution

Regardless of the print size specified for an image, the size of an image on-screen is determined by the pixel dimensions of the image and the monitor size and setting. A large monitor set to 640-by-480 pixels uses larger pixels than a small monitor with the same setting. In most cases, default PC monitor settings display 96 pixels per inch, and default Macintosh monitor settings display approximately 72 pixels per inch.




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