CHANGING IMAGE SIZE AND RESOLUTION ON YOUR MAC (USING PREVIEW)

MAC users - this is an easy way to change the size and resolution of images using the PREVIEW app that is right on your computer, and which you probably already use.

STEP #1 - Take a photo or scan an image.

STEP #2 - Put it on your desktop. 

STEP #3 - Click on the photo on the desktop to open it in PREVIEW

On the PREVIEW screen, click on TOOLS.

STEP #4 - After you click on TOOLS a screen will drop down that lets you change SIZE and RESOLUTION

 Click the down arrow to allow changing to INCHES, then change the largest measurement to the size you need (say to 7", for 5 X 7). Be sure there is a check mark in SCALE PROPORTIONALLY.

Change the RESOLUTION to either 72 or 300 (Tom says 72 is enough to keep FB happy)
Click OK to save your changes, and you should be done.