Do your Photoshop .psd file sizes seem a little large? It may be because of a preference setting that makes Photoshop save a flattened version of your Photoshop image, along with your layered Photoshop file.
Why does Photoshop do this? Because there's a slight possibility you might share this file with someone using Photoshop 2.5 (just like there's a slight possibility that Congress will vote to cut their own salaries), and Photoshop 2.5 didn't support layers, so it can't read your layered document. But because, by default, that flattened version is included in your layered file, guess what2.5 can open the flattened image. What luck! Who cares? I'd rather have smaller file sizes all year long, and if you would too,
go under the Photoshop menu (the Edit menu in Windows), under Preferences, under File Handling, then in the File Compatibility section, for Maximize PSD File Compatibility, change "Ask" to "Never." Think about this one for a minute and you'll wonder why this is turned on by default. Think about it for two minutes and you'll wonder why it's in Photoshop at all. Don't spend too much time on it, or you'll start to wonder who's the poor soul that's stuck on version 2.5.
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