Use Photoshop comparison techniques to increase your efficiency, especially when colour correction, precision retouch, or complex or subtle changes require constant comparison between the original and the manipulated images. Start by opening a file to edit.
Duplicate the File
From the "Image" menu, choose "Duplicate" to create a new, separate file of your selected picture and all previous layers, masks and other changes you have made. This is a safe way to edit because it leaves the original file intact. It also avoids confusion because "Duplicate" automatically renames the file. Duplication allows exploring "what-ifs" about the image without extensive restoration efforts if the proposed changes are later vetoed.
Replicate the File
On the "Window" menu, choose "Arrange," then "New Window for [file name]." This creates a copy of the original photo/file; what you do to one affects the other. Work with one copy at magnification, the other at finished-use size to see editing results without constantly resizing the screen image. Use this comparison method for color correction and retouch, especially when making changes on a pixel level that affect the final image.
Arrange Images Onscreen
To arrange the photos on your screen, select the "Window" menu and choose "Arrange," then "Tile" to place the images side-by-side or "Float All in Windows" to put one window above another. Determine your work area on an image, then choose "Match Location" from "Arrange" to align the other image to it.
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