How to Resize Pictures on Macs

By Brandy Alexander

With a Mac computer, you have the option to edit the size of your digital pictures using iPhoto. The iPhoto program is a native application on Apple's Mac OS X computer operating system, and it enables you to load your images seamlessly from your digital camera or from your computer files. Once loaded, use the provided tools to make your images larger or smaller to publish them on the Web, send them to other people electronically or produce items, such as photo books, that contain your pictures.

Things You'll Need

  • Digital camera with USB cable (optional)

Step 1

Plug the USB cable that comes with your digital camera to the camera's USB port and then connect the other end of the cable to your Mac computer's USB port. Turn your camera on. If you are unsure about the cable or port on your camera, consult the documentation that comes with your product for specific instructions on your particular model.

Step 2

Click the "Use iPhoto" box that automatically appears on your Mac if this is the first time you are connecting your camera. If iPhoto does not automatically start, click the "Finder," click "Applications" and then double-click the "iPhoto" title to launch the software. Follow the prompts to name your batch of pictures and import them into the application.

Step 3

Click on the pictures that you want to modify and then click the "Export" option under the "File" menu. Click the "File Export" button when the "Export Photos" dialog window automatically appears.

Step 4

Click the drop-down menu next to the "Size" title and then select the "Small," "Medium" or "Large" option to generate compressed pictures suitable for the Web. Use the smaller size if you anticipate that visitors do not want to download the graphics, choose the medium setting for viewers that have a faster DSL connection and opt for the larger size if you know that people plan to make prints out of your images. You can also select the "Custom" option to input the pixel dimensions you wish to use to resize your photo. Further, choose the "Optimized" or "Actual Size/Full Size" setting to produce images that display full detail for printing. Choose to optimize your photos for use in your MobileMe Gallery, or make your pictures actual or full size to display their true dimensions and create the highest quality prints.

Step 5

Click the "Export" button and use the dialog window that appears to determine where you want your modified picture files downloaded on your computer.

Tips & Warnings

  • If your camera does not connect successfully to iPhoto, check the documentation that comes with your device to see if you need to first install software or set your camera to a particular mode.
  • If you want to edit the image dimensions of photos already on your Mac's hard drive, click and drag your mouse over the picture files to select them and then drop them on the iPhoto application to automatically load them in the program.