If the image is not in a normal format that can be fit in a 16:9 or 8:5 screen, and is "landscape" it should be in panorama mode, ideally based on information density of the image. However if it is portrait then it should at least show the image thumbnail before doing a top-to-bottom pan.
If the image is not in a normal format that can be fit in a 16:9 or 8:5 screen, and is "landscape" it should be in panorama mode, ideally based on information density of the image. However if it is portrait then it should at least show the image thumbnail before doing a top-to-bottom pan.