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As I already mentioned, a 4 6-inch inkjet print typically requires an 800 1,200-pixel image to start with to avoid pixels and jagged edges in the final image That s almost twice the resolution that a VGA-resolution 640 480-pixel digital camera can muster So you can see the value in having a 2- or 3-megapixel camera What happens if you print an image that doesn t have enough pixels for the size you want to achieve You get something like Figure 15-4
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CHAPTER 15: Printing Your Pictures
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FIGURE 15-4
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This happens when you try to print a low-resolution image too big
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If the output size isn t as important to you as having a sharp, quality print, then just print the image smaller Cramming those pixels together on paper in less space will make the print sharper In reality, you may still get adequate results printing even a 640 480-pixel image at 4 6, even though that only works out to 100dpi If you look carefully at the finished print, you ll find that you can see jagged edges where there weren t enough pixels to fill in For best results, pick a size that lets you print around 200dpi, or whatever resolution best matches your particular printer That s what happens when you print too few pixels for the size you re shooting for What about too many pixels Can an image that s too high-res ever be a problem The answer is generally not Too many pixels isn t really a problem, though it does make your image file bigger than it has to be, and it can potentially bog everything down The bottom line is that if you pack more pixels than you need into an image above 200dpi, for instance odds are good that you won t improve image quality very much Instead, you ll just make the file bigger, which takes more storage space on your hard disk and can slow down the printing process Test your own printer by generating prints in high-quality mode at 150, 200, and 250 dpi Use these to figure out what the resolution threshold of your printer is, and strive to use that setting as often as possible
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Of course, all this advice is specifically for someone who wants to know how much resolution an image needs to print well at a certain output size If you just want to print an image and don t care how big it turns out, just print it Most image editors have an option to let you print the image at full-page size or at the image s normal size If you choose normal size, the image will print smaller than full page and probably look just fine It s only when you force the image to print at a certain size that the image s original resolution becomes important On the other hand, you should set the print size yourself whenever possible, If you allow the printer driver to resize the image on its own, it ll usually just scale the image and introduce a lot of pixelization in the process
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Here s a common scenario: You see great, photo-realistic prints in a computer store and think, That s the printer for me It s only $150 and it makes outstanding pictures! So you buy the printer and bring it home But when you actually get the printer set up and send your first few images to it, you re devastated The output is horrible The prints look flat and lifeless The paper curls What went wrong It s the paper What you failed to consider is that the choice of paper is so important to the quality of your prints that it s essentially more important than the printer itself ! There are a handful of printers on the market that can generate photo-realistic prints But unless you use quality paper, they will all disappoint you
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