A note: double scale should only ever be used if you have a 1080i/p TV.
Double-scaling is basically exactly as it sounds. It is literally doubling the native resolution of a DVD (480p to 960p), and then boxing it in black to get it to a native 1080p resolution for TV compatibility.
Why do this? This is how anal the engineers working on PS3's media functionality are
. When doing standard upscaling (regardless of the algorithms/filters employed), you are going from 480p (once deinterlaced) to either 720p or 1080i/p. That is not an evenly divisible conversion, so NONE of the original pixels remain in the upscaled image. All pixels are interpolated. When doing double-scaling, all the original pixels still remain … with the newly interpolated pixels filling out the rest of the resolution.
Basically, it’s for people looking for the most accurate image as compared to the original source material. On most material, I do find it subtly crisper … but that is a bit hard to verify since the image size is smaller. Once I get a front-projector, I think this will be especially interesting to mess around with.
Normal is the more traditional upscaling setting. It will fill your screen to the contents aspect ratio. This is obviously all interpolated data as mentioned above, and may be ever so slightly softer due to the nature of interpolation). It is really quite good compared to standalone DVD players.
I actually went over some settings for a previous poster a little while back. Here’s a link ->
PS3 DVD Upconversion Settings
Basically, it comes down to your setup, specific DVD, and personal preference for some of the settings.
Official PS3 Upscaling Thread
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