Editing and annotating images with Preview
By now you’ve accumulated plenty of documents—music, movie, image, text, and PDF files—and at this point you may want to do something with those files beyond flinging them into folders. One of the best ways to get any such doing done is to double-click them. Try it and their default application opens. In the case of pictures and PDFs, that default application is Apple’s Preview.
As its name implies, Preview is designed to let you view documents. But it doesn’t have mystical all-seeing powers. Rather, it confines its talents to image and PDF files.
Preview’s ability to open image files is very broad. The application supports the major image formats—including those that bear the bmp, gif, jpeg, pict, png, and tiff extensions—as well as rarer file types. And it can export images to most major file types. In addition, you can use Preview to lightly edit these files. For instance, if you need to cut Cousin Jo-Jo out of a photo, you can use the Crop tool to do just that. You can also rotate images, adjust their color and size, annotate them, and select specific portions of them (everyone but Cousin Jo-Jo, for example).
Similarly, you’re not limited to viewing PDF files. You can combine multiple unprotected (meaning not locked by the document’s creator) PDF files into a single document; rearrange their page order; and annotate, crop, and sign PDFs.
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http://www.macworld.com/article/2045136/editing-and-annotating-images-with-preview.html#tk.rss_all
