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For previewing images you can either use "Light table" mode and advance from image to image via cursor keys or switch to "Slide show" mode and either just watch images flow by or advance them manually. The slide show feature also lets you show more than one image on the screen at a time, which is helpful if you want to compare photos. There is also a helpful info window on the left hand side of the catalog that carries the image’s Media info and EXIF data.