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The appropriate resolution setting depends on what you plan to do with your image:
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You need 200 300 pixels per each linear inch of your print; the exact number depends upon the printer. Home photo printers, for example, tend to deliver the best results when fed 300 pixels per inch (ppi), while commercial machines used by retail photo labs produce great prints at just 200 ppi. Consult your printer manual or the retail technician to find out the optimum resolution, and do your own testing to see whether you notice any significant difference at a higher or lower ppi.
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A resolution of 640 480 pixels sometimes referred to as VGA resolution is usually adequate. That setting gives you enough pixels to fill the entire screen on a monitor that s running at a screen resolution of 640 480. Most people today set their monitors to a resolution of at least 800 600, but keep in mind that the web browser itself eats up some of the available screen space. Also remember that fewer pixels means smaller file sizes and therefore faster download times. Follow the same guidelines as for web photos, matching the pixel dimensions to the display device.
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When you re not sure how you plan to use your picture, shoot with print output in mind. If necessary, you can easily eliminate extra pixels in a photo editor. You can add pixels in a photo program, too, but you won t get any noticeable improvement in print quality by doing so. In fact, your prints may look worse than they did before you added pixels. So when in doubt, always opt for too many pixels rather than too few. Shooting pictures at a decent resolution setting also gives you more flexibility in the editing stage because you can crop and enlarge a portion of the image to good result. This benefit becomes especially important when you re shooting spontaneous events, such as parties, or when you re photographing moving targets. You don t always have the opportunity to achieve the perfect composition, and starting with a high-resolution image enables you to correct the framing later, as shown in Figure 2.3. Although the children in the original portrait in Figure 2.3 look terrific, the objects on the sofa table behind them are distracting. To create a better image, I opened the picture in my photo editor and cropped the image to the horizontal framing indicated by the black box.
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CHAPTER 2: Exploring Creative Controls
How To
MATCH CAMERA RESOLUTION TO PRINT SIZE
If you know the optimum image resolution (ppi) to send your printer, you can calculate what camera resolution you need to produce a quality print at a specific size. Just multiply print width by the ppi value to determine how may horizontal pixels you need, and multiply print height by the ppi value to determine vertical pixels. The following table provides a quick reference to the number of pixels needed for quality prints at standard frame sizes, assuming an optimum image resolution of 200 ppi. Note that because the aspect ratio of a digital camera image is 4:3, which is different from that of traditional photo frames, most cameras won t offer a resolution setting that matches these pixel counts exactly. Go with the setting that gets you closest to the larger of the two pixel values. You can then crop the image to the correct frame size in your photo editor. 3 provides more information about digital camera aspect ratios.
PRINT SIZE 3 5 in. 4 6 in. 5 7 in. 8 10 in. 11 14 in. PIXELS* 700 1000 800 1200 1000 1400 1600 2000 2200 2800 MEGAPIXELS <1 1 1.5 3.2 6
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