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Info Wanted: Moth3r's PAL trilogy vs. anamorphically enhanced GOUT's — Page 2

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Originally posted by: totsugeki
Originally posted by: Red5
I've measured the multiburst VITS (Vertical Interval Test Signal) on a few of my PAL LDs and at best the 5 Mhz burst was at -4 dB and quite noisy, so the 5.5 Mhz bandwidth of PAL LD is in practice more like just below 5.0 Mhz.

Does that mean that Laserdiscs have test signals embedded in them (during blanking)?

Yes, on all THX releases and infact it seems many of the rest of them as well, not always with a multiburst line though.


Also, I'm still wondering about Moth3r's statement about DVD's 6.75 MHz translating into 540 lines. Shouldn't it be 720 lines?

No, I believe Moth3r is talking about LINES OF RESOLUTION

For example, since the current DVD format has 720 horizontal pixels (on both NTSC and PAL discs), the true horizontal resolution can be calculated by dividing 720 by 1.33 (for a 4:3 aspect ratio) to get 540 lines. (On a 1.78 [16:9] display, you get 405 lines) In practice, most DVD players provide about 500 lines instead of 540 because of filtering and low-quality digital-to-analog converters.

Although todays DVD players with 108 Mhz DA converters should have no problem reproducing the full 6.75 Mhz bandwidth or 540 lines.

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Actually I used a general rule of thumb that 1MHz = 80 lines of resolution.

So:
DVD 6.75MHz x 80 = 540 lines.
Laserdisc (in theory) 5.5MHz x 80 = 440 lines, in practice even the best players "crap out" (as Laserman put it) above 5MHz, so the figure is probably nearer 400.

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Finding this thread just saved me from my desire to get the PAL dvd's... I guess if I have the NTSC dvd's of the GOUT, that I have the best I can buy... I'm working on finding the best I can get.

One suggestion I have for maximizing quality when converting the NTSC 4:3 image to a 16:9 image is to over size it. Convert the 720x480 image to 1440x960 before enhancing or cropping it. I noticed that some of the finer details visible in the GOUT DVD vanished in Moth3r's enhanced version. (the lines on R2's back). I've had good luck with this when enhancing photos and a movie is just a series of photos.

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It has since been discovered that the Region 2/4 PAL disc of Jedi is slightly more detailed than the Region 1 NTSC. So the best would be:
ANH - Region 1 NTSC
ESB - Region 1 NTSC
ROTJ - Region 2/4 PAL

But I must stress that the quality differences are very, very small.

As for your suggestion, resizing up, filtering, then resizing back down to target res is a common trick - some filters work better if they have more pixels to play with. Upscaling with one of the new EDI filters may give better results.

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