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Chapter 19. Working with Files > Troubleshooting - Pg. 271

Working with Files 271 · Resolution.The number of pixels per inch describes the resolution of a picture; the higher the resolution (the more pixels per inch), the more detail that can be seen. If you're printing an image on a high-quality photo printer, you need to go with 300 pix-els/inch; if you're printing on a con- sumer-level color inkjet, you can get by with 150 pixels/inch; for Web use or online viewing, 72 pixels/inch is sufficient. If you're sending a family photo via e-mail that will be viewed onscreen only, you can reduce the file size by doing the following: · Size the picture so that it's close to a 640 × 480 pixel size, which is ideal for onscreen viewing without scrolling · Choose 16-bit color (65,336 colors) · Select 72 pixels/inch resolution If you think that any of your recipients will be printing the picture, you may want to increase the resolution to 150 pixels/inch. Tip Know that some graphics formats do not offer these compression options. The most com- pressible graphics format is .JPG; .GIF is also relatively efficient. The worst format for com- pressing is .TIF, which conversely is the preferred format for files you intend to print . File Viewing After you've downloaded a bunch of data and graphics files, how do you view the contents of those files? Many files (especially graphics files) can be viewed from within your Web browser, but you may need a more powerful file viewing program to view a wider variety of file formats.