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Uh, you're right. And 16:9 actually loses less data via cropping for a 3:2 image than a 4:3 screen would, though it's a lot in either case: 10.42% vs. 16.7% of the original image is lost. For reference, though, cropping a 4:3 image to 16:9 loses 18.75% of the image.

That doesn't sound quite right. Cropping a 3:2 image for a 16:9 screen is the same as cropping a 48:32 image for a 48:27 screen, so you're losing 5/32 or 15.6%. Likewise, cropping 3:2 for 4:3 is like cropping 9:6 to fit 8:6, so losing 1/9 or 11.1%. So 4:3 is better than 16:9 even for 3:2 originals. And cropping 4:3 to 16:9 is like cropping 16:12 to 16:9, losing 3/12 or 25%.

Peter