Resize photos for e-mail
Before sending photos to friends and family via e-mail, make sure your pictures won't fill up their inboxes or be too large for them to view onscreen.
Step 1: Double-click any photo from your library.
Step 2: Select Edit Photo > Resize from the menu choices on the left of the screen.
Step 3: Choose E-mail 640 x 425 from the available choices. (These dimensions are ideal for emailing. You can create a custom size if you like, but file size may increase.)
Step 4: Click the Save a copy box, and then the Save button.
Step 5: Browse to the file when attaching it in your email program.
Resize photos for Web pages
If you're posting photos on a Web page, consider how many photos will be displayed on the page before resizing. Every photo takes up available screen pixels, so the more photos there are on a page, the smaller each needs to be in order to fit. Photos also require time to download, so Web pages load more slowly when there are multiple images (and more pixels). Do site visitors a favor and keep images relatively small to save time.
To size images just right for the Web, follow the same steps listed above, but choose Web/Blog 320x212. Instead of E-mail.