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Re: Using Progressive footage in comp that will be interlaced... how to interpret?

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Steve Roberts
Re: Using Progressive footage in comp that will be interlaced... how to interpret?
on Oct 27, 2006 at 2:48:19 am

Here's how it goes:

If you're creating motion graphics from scratch, it's your choice: render fields or no fields. Just make sure you pick the right field order if you render fields.

If you're creating motion graphics over field-rendered footage that you will not change in any way (or footage that you will neither blur, move, rotate nor distort the pixels), you should interpret the footage with field separation off (leave as is), then render with fields if you want the motion graphics to match the footage. And you usually do.

If you're doing the above with no graphics (say, just color-correcting), you should interpret with field separation off, and render with no fields. This just leaves everything as it was: a series of frames with comb-like images on them, only now coloured slightly differently. Actually, in this case, rendering with fields wouldn't change anything either, since there's no motion to render interlaced or field-separated footage to reassemble.

If you're creating motion graphics over progressive footage (whether you distort it or not), you interpret the footage field separation off, then render with no fields so the graphics match the footage.

If you're creating motion graphics over field-rendered footage that you expect to move/rotate/blur/distort pixels, you must interpret with fielld separation on, and the choice of field order is crucial: you must pick the correct order. Pick one, then alt-double-click on the footage, then step through the footage in the just-opened layer window with the PageDn key. If it jerks back and forth, you picked the wrong field order. If it only moves on every second keystroke (if you separated fields), the footage is progressive. Once you get the field separation right, you can choose to render with fields or without. Do a test.

You should get the discs by Chris and Trish Meyer called "Videosyncrasies".


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