RESOLUTION - Basic Computer 2 The Basics Adobe Photoshop...

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Topics Covered Understanding resolution issues Monitor resolution The number of pixels or dots displayed per unit of length on the monitor, usually mea- sured in dots per inch (dpi). Monitor resolution depends on the size of the monitor plus its pixel setting. Most new monitors have a resolution of about 96 dpi, while older Mac OS monitors have a resolution of 72 dpi. Understanding monitor resolution helps explain why the display size of an image on- screen often differs from its printed size. Image pixels are translated directly into monitor pixels. This means that when the image resolution is higher than the monitor resolution, the image appears larger on-screen than its specified print dimensions. For example, when you display a 1-by-1 inch, 144-ppi image on a 72-dpi monitor, it appears in a 2-by-2 inch area on-screen. Because the monitor can display only 72 pixels per inch, it needs 2 inches to display the 144 pixels that make up one edge of the image. To check the actual size of the image in inches or picas, go to the Main menu>Image>Image size. Re-sizing images Resampling refers to changing the pixel dimensions (and therefore display size) of an image. When you downsample (or decrease the number of pixels), information is deleted from the image. When you resample up (or increase the number of pixels), new pixels are added based on color values of existing pixels. Resizing downward in resolution eliminates excess file size which can save space in memory and prevent increased RIP times at the printer. If a larger, high quality image is needed, it should be re-scanned at a higher resolution. For flexibility in working with images, high resolution scans at 300 to 600 ppi allow for archiving high quality images as well as resizing. Scan once at the high end and create a low resolution versions of the image to be used for preliminary page layout (called FPO – “For Placement Only”). This reduces file size and re-drawing time of the previews.
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