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Re: PAL content going 4:3 instead of 16:9

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Jeff Pulera
Re: PAL content going 4:3 instead of 16:9
on Feb 18, 2014 at 6:16:19 pm

Hi John,

Looking at the chart you referenced, in the right-hand column regarding aspect ratio, you'll notice that the 1050x576 format does not come out to 16:9, so I would not worry about that one, stick with 1024x576.

I believe what the writer is getting at is that DV PAL doesn't start with a PAR of 1.0 - PAL is 1.09 and NTSC uses 0.9, so what he's saying is that since the starting point is NOT a square pixel with 1.0 PAR, that changes what the wide conversion ought to come out to, if one wants to get technical about it. So if for instance there is a graphic of a perfect circle in the original clip, it may be slightly off after converting to square pixels.

You'll find that 720x1.4587 does come out to 1050, so that's where that figure comes from, but for simplicity let's just say 1024x576 provides a 16:9 result and that is close enough without over-analyzing it all.

At the urging of the BBC, Adobe did change some aspect ratio calculations starting with CS4 - http://www.mikeafford.com/blog/2009/03/pal-d1-dv-widescreen-square-pixel-se...

Thanks

Jeff Pulera
Safe Harbor Computers


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