Flattening a layered image

If you plan to send a file out for proofs, it’s also a good idea to save two versions of the file—one containing all the layers so that you can edit the file if necessary, and one flattened version to send to the print shop. When you flatten a file, all layers are merged into a single background, greatly reducing the size of the file.

1.
First, note the values in the lower-left corner of the application window (Windows) or the 11Start.psd image window (Mac OS). If the display does not show the file size (such as “Doc: 909K/6.4M”), click the arrow on the bottom of the window to open a pop-up menu, and choose Document Sizes. The first number is the printing size of the image, which is about the size that the saved, ...

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