Adobe 23101335 User Guide - Page 102
About image size and resolution, Pixel dimensions
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92 CHAPTER 2 Getting Images into Photoshop and ImageReady Vector graphics are resolution-independent- that is, they can be scaled to any size and printed at any resolution without losing detail or clarity. As a result, vector graphics are the best choice for representing bold graphics that must retain crisp lines when scaled to various sizes-for example, logos. 3:1 24:1 Vector graphics are good for reproducing crisp outlines, as in logos or illustrations. They can be printed or displayed at any resolution without losing detail. Because computer monitors represent images by displaying them on a grid, both vector and bitmap data is displayed as pixels on-screen. For example, a 15-inch monitor typically displays 800 pixels horizontally and 600 vertically. An image with dimensions of 800 pixels by 600 pixels would fill this small screen. On a larger monitor with an 800-by-600-pixel setting, the same image (with 800-by-600-pixel dimensions) would still fill the screen, but each pixel would appear larger. Changing the setting of this larger monitor to 1024-by-768 pixels would display the image at a smaller size, occupying only part of the screen. When preparing an image for online display (for example, a Web page that will be viewed on a variety of monitors), pixel dimensions become especially important. Because your image may be viewed on a 15-inch monitor, you may want to limit the size of your image to 800-by-600 pixels to allow room for the Web browser window controls. 20" 15" About image size and resolution In order to produce high-quality images, it is important to understand how the pixel data of images is measured and displayed. Pixel dimensions The number of pixels along the height and width of a bitmap image. The display size of an image on-screen is determined by the pixel dimensions of the image plus the size and setting of the monitor. 832 x 624 / 640 x 480 1024 x 768 / 640 x 480 How large an image appears on-screen depends on a combination of factors--the pixel dimensions of the image, the monitor size, and the monitor resolution setting. The examples above show a 620-by-400-pixel image displayed on monitors of various sizes and resolutions.
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