September 2004 HelpLine

For discussion, let’s use 1024×768. If you try to display an image that’s 2272×1704 outside of image-processing software, the pixels are going to map to the display one to one. Since it’s much larger than the actual display area, the image is going to go off the screen.

If you want to get the image to display directly on someone else’s monitor, you’ll need to resize the image so that the pixel count is under 1024×768. You can do this either by adjusting the image measurements or changing the number of pixels. When adjusting image measurements (inches, for example), you need to adjust the ppi/dpi setting also. In the case of computer displays, 72 dpi should work well. So if you size the image to 5×3.75 inches at 72 dpi and e-mail it, the receiver of the image will see your picture at about that size on their monitor. Although there are some variables—the actual monitor size, the display settings on the receiving end—this adjustment should work for most setups.

A more important point to consider when e-mailing images is file size. If you don’t resize the image before sending it, you could be sending a very large file, which might cause a few problems:

• It might take a long time to download. The recipient might only have a dial-up connection, or even if he or she has broadband, the recipient might be “on the road” and not have his or her normal high-speed connection.

• The recipient’s Internet service provider (or business e-mail account) might have a limit for attachment file sizes. This might mean the recipient wouldn’t get your image.

So before you send a file, pay attention to file size.

Digital Terms

Q)  I’m doing research about digital cameras, but sometimes I get stuck with terms. What does SLR mean? What’s the difference between an SLR and a regular digital camera? Some ads say a camera comes “body only.” Does that mean it doesn’t come with any lenses?

Marcelo Lucas
Via e-mail

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