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16:9 image input 16:9 image
16:9
aspect ratio
16
9
4
3
4:3 image input 4:3 image on 16:9 screen
black bars
black bars
4:3 aspect ratio
16
9
letterbox image input 16:9 image fills 16:9 screen
black bars
black bars
4
3
letterbox
aspect ratio
4:3 image fills 16:9 screen
natural wide
aspect ratio
4:3 image input
4
3
16
9