Cool Tip to Generate Image File Using Preview

Here’s a simple way to save an image using Mac’s Preview.

• All you have to do is copy an image, open up Preview,
• Choose "New Image from Clipboard" in the File menu.
• The image in your clipboard will then show up like any image you've opened in Preview, giving you all the options you have with standard image files.
• You can edit it as you like, then save it out to one of many format options, or email it.

Source: Quickly Generate Image Files from Clipboard Using Mac OS X’s Preview Application.