OSXFAQ Mac OS X Design Tip-of-the-Day  

When you're dragging Photoshop layers between documents, have you noticed that if part of your layer extends outside the edge of your document window, Photoshop doesn't delete those areas? Yep, it's still there. For example, if you drag an image of a car over to a new document and position it so that only the front half is showing, the back half (even though you can't see it) is still there. If you decide later that you want to show the whole car, you can simply drag the car further into your image window and the parts hidden off screen will appear. That's good, right? Well, sometimes. Actually, it's only good if you think that at some point you might need those parts. Otherwise, you're eating up memory storing stuff that you don't need. Want to get rid of all that excess image data? Press Command-A to Select All, then go under the Edit menu and choose Crop. Everything outside your image window gets cropped off, shrinking your file size in the process.

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