Both the Windows and Mac OS X operating systems feature built-in tools that allow you to resize images without skewing the picture's aspect ratio, letting you modify your pictures for Facebook use without having to install third-party software. This ensures that the image will retain its height-to-width ratio once resized.
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Open the Finder and browse to the image you want to resize. Double-click on the file to open it in Preview.
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You can also adjust the resolution pixels per inch that your photo contains. Adding pixels does not necessarily mean you will have a higher-resolution photograph, however, and some distortion can occur when resampling. Also keep in mind that higher-resolution images are bigger files. Preview is also a great tool for doing all kinds of other simple adjustments on images. If you need to take out a background on an image, you can use Preview's Instant Alpha feature to quickly and easily complete the task.
Resizing an image
The Instant Alpha tool is located in Preview's tool bar, under the Select menu. Once you have the tool selected, click on part of the background you wish to delete and begin dragging.
The red overlay that appears represents the area that can be deleted. Drag until the space is covered and let go. Press delete on your keyboard and the area will be removed. In order to keep the image with the background deleted, you must save it as a PNG or GIF file with the alpha check box selected.
Now you know how to quickly resize a photograph and create images with alpha backgrounds. But, what if the color on your image is off slightly?
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Well, Preview can fix that, too. You can access the Applications folder through LaunchPad and your Finder. Type the scale, resolution and minimum and maximum pixels you want to apply to any images in your PDF.
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Open the PDF you want to resize and apply the Reduce File Size Copy filter as described in the steps 6 and onward of the previous section. Click the location on your hard drive where you want to save the PDF, such as "Desktop" or "Documents. Sophie Southern has been a freelance writer since