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The Crop Dialog Box
You provide image cropping information with the CROP dialog box that appears when you click the Crop icon.
Stack indicates that multiple images will be cropped.
If no cropping has been applied previously to this image, drag a rectangle around the area of the image you want cropped. If previous cropping has been defined, that cropping rectangle is shown superimposed on top of the image displayed in this dialog box. Move and reshape the crop rectangle as described next.