Pixel Aspect Ratio Question

[Roland R. kahlenberg]

Unless you’re intending to do some speed related thingy, always interpret your footage at its original settings.

I never use the pixel aspect ratio correction button thingy for the reasons you have alluded to.

I always work in square-pixel comps until I am ready to render. At this stage, I nest my square-pixel comps into its relevant non square-pixel aspect ratio comp and render that out.

HTH
RoRK

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[Scott Roberts]

“I always work in square-pixel comps until I am ready to render. At this stage, I nest my square-pixel comps into its relevant non square-pixel aspect ratio comp and render that out. ”

Roland, can you please elaborate on this?

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[Roland R. kahlenberg]

Hi Scott, for PAL the non-square output, which is prevalent these days, is 720×576. It’s square PAR ‘cousin’ is 768s576.

So, I work within a 768×576 comp throughout the project – precomps and ‘final comp’. When it comes time perform a final render, I nest the 768×576 comp into a 720×576 comp and render this out.

Take note the CS4 does some changes to PAR and comp sizes – so the values I’ve stated will not tally for CS4 users. But the methodology is still correct.

HTH
RoRK

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[Todd Carter]

appreciate the responses. One question that i still have… in this scenario i have some non-square footage that has to be mixed with some square graphics. Would you still recommend doing all the work in a square pixel comp, then before a final render… nesting into a non-square comp? If so, in what kind of scenario would you interpret footage from non-square to square or reverse? thanks for your help, and sorry about the confusion…

[David Ghast]

Try it both ways and see which one turns out better.

[Roland R. kahlenberg]

[Todd Carter] “in what kind of scenario would you interpret footage from non-square to square or reverse?”

Never. Always interpret your footage based on its inherent characteristics. Changing any characteristics results in unwanted outcomes. The only exception is with framerates when one wants to lower frame rates to achice a certain effect but that’s pretty advanced stuff and theer are other ways of achieving the same result.

[Todd Carter] “Would you still recommend doing all the work in a square pixel comp, then before a final render”

Yes, This is common. Video is almost always 720×576 (non square PAR) while graphics from Photoshop or Illustrator are always in various sizes but always in square PAR (at least’s how I create them).

HTH
RoRK

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