Graphics Programs Reference
In-Depth Information
This section gives you a brief introduction to both onscreen and print resolution, especially
in terms of what decisions you'll need to make when using the Resize Image dialog box.
You'll also learn how to add more canvas (blank space) around photos, which you'd do to
make room for a caption below an image, for instance, or when you want to combine two
photos.
To get started, open a photo you want to resize and then go to Image→Resize→Image Size
Figure 3-19. This dialog box gives you two different ways to change a photo's size. Use the settings
shown here when preparing a photo for onscreen viewing. (The number next to Pixel Dimen-
sions—here, 28.6M—tells you the current size of your file in megabytes or kilobytes.) Before you
can make any changes here, you have to turn on the Resample Image checkbox at the bottom of the
dialog box (not shown), since changing pixel dimensions always involves resampling (see page
111).
Resizing Images for Email and the Web
It's important to learn how to size photos so that they show up easily and clearly onscreen.
Have you ever gotten an emailed photo that was so huge you could see only a tiny bit of it on
your monitor at once? That happens when someone sends an image that isn't optimized for
onscreen viewing. Happily, it's easy to avoid that problem once you know how to correctly
size photos for onscreen use.
The Image Size dialog box is divided into two main sections: Pixel Dimensions (visible in
Figure 3-19
) and Document Size. You'll use the Pixel Dimensions settings when you know
