How to Use Preview Like a Pro in Mac OS X 10.6

If you are thinking of buying Photoshop or another expensive photo editing program, first consider a program built right in to your Mac. If you are buying Photoshop so you can take the background out of a photo, highlight a certain part of...

Method 1 of 3:

Taking the background out of images

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    Open Preview.
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    Use Preview to open your image. Go to File>Open and choose the image you wish to open.
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    Click the "Select" drop-down menu.
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    Choose the "Instant Alpha" button.
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    Click wherever you want to erase the background.
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    You will notice that part of your picture turns red.
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    Drag until most of your background is red.
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    When you have most of the background selected, hit the "Delete" key.
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    This won't erase all of the images background, but it should get most of it.
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    Now it comes down to personal preference on which tool to use to clean up the rest of the background.
Method 2 of 3:

Isolating a part of a picture

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    Drag a rectangle (or circle if that's what you want) around the area you want to keep.
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    Hit the "Invert Selection" button under the "Edit" menu.
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    Hit "Delete"
Method 3 of 3:

Annotating on a Picture/PDF

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    Open your picture.
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    Hit the "Annotate" button
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    Make your selections!
Update 04 March 2020
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