1 Make sure that all the layers you want to keep are visible.
2 Choose Layer > Flatten Image, or choose Flatten Image from the Layers palette menu. Tracking file size
File size depends on the pixel dimensions of an image and the number of layers contained in the image. Images with more pixels may produce more detail when printed, but they require more disk space to store and may be slower to edit and print. You should keep track of your file sizes to make sure the files are not becoming too large for your purposes. If the file is becoming too large, reduce the number of layers in the image or change the image size.
You can view file size information for an image at the bottom of the application window (Windows) or document window (Mac OS). For more information, see "Displaying file and image information" on page 48.
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Adobe Photoshop can be a complex tool only because you can do so much with it, however for in this video series, we're going to keep it as simple as possible. In fact, in this video you'll see an overview of the few tools and Adobe Photoshop features we will use. When you see this video, you'll see how you can do so much with so few features, but you'll learn how to use them in depth in the future videos.