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The Crop Overlay tool makes it simple to improve your composition, crop away unwanted edge detail, and even straighten your image.
1. Click to select the raw image DSC_6058.NEF in the Filmstrip.
2. If you’re not already in the Develop module, press the D key or choose View > Go To Develop. Hide the Filmstrip and the left panel group to expand the work area; you’ll find keyboard shortcuts for showing and hiding any or all of the workspace panels listed beside the commands in the Window > Panels menu. If you’re not already in the Loupe view, press the D key again, or click the Loupe view button () in the Toolbar. If you don’t see the Toolbar, press the T key.
3. Click the Crop Overlay tool ()button just below the Histogram panel, or press R. A crop overlay rectangle appears on the image in the Loupe view and a control pane for the Crop Overlay tool opens above the Basic panel.