Comments

MrEd wrote on 8/25/2003, 5:31 PM
Oh here is one for you. How come when I put motion on a jpg, for example spin it around really fast, and then render it at BEST quality these lines show up. BUT... If I render it at PREVIEW quailty the lines are not there.
You can't really tell the difference between Best and preview but I still want the best quality, but then the lines show up for the fast motion. Is there any way to fix this?

Thanks so much!

-Ed
BillyBoy wrote on 8/25/2003, 9:38 PM
The problem MAY be how best and good rendering works. They use different methods of interpolation... just a fancy word to explain how the pixels get shifted around. Its also the reaon why BEST takes longer to render.

A GOOD and lessor render settings uses Bilinear Interpoliation while BEST uses Bicubic Interpolation which involves many more caculations. In simple terms its how the different colored pixels get blended.

If you use Bicubic Interpolation on objects that move fast the extra sampling may actually end up with worse results because using the Bicubic method instead of just sampling pixels at right angles to the one being adjusted as happens in Bilinear, with Bicublic it takes it a couple steps further also sampling the pixels on the diagonal and then applies a weighted average.

So just maybe, you may get better results and for sure you'll get a fast render if you drop back to GOOD.
MrEd wrote on 8/25/2003, 10:12 PM
Hummm, ok well thanks for the advice.
Have a good one.

-Ed
farss wrote on 8/25/2003, 11:12 PM
BiilyBoy,
you just answered one of my VV riddles, never knew what the difference was between Good and Best in the render settings. So basically for most things with only straight cuts and dissolves there's no advantage in going to Best?

Wish this info was made a bit more accessible in VV!
BillyBoy wrote on 8/25/2003, 11:35 PM
I would say generally its more what TYPE of video, content wise. If you're doing something where you have a lot of tight close ups of someone's face or maybe a nature kind of video or anything where very subtle changes in hue and skintone will be more noticeable and desireable then maybe you'd want to use best. Otherwise, ususally not because all you're really doing is making Vegas make your CPU do many more caculations which will only slow down rendering.

My understanding is its also relative you how your change your source video. If you're mostly just making straight cuts, snipping scenes out and/or rearranging, stuff like that I don't think interpolation comes into play.

Its when you shift pixels around like applying filters, changing frame size, pan/crop/zoom anything that causes Vegas to need to shuffle pixels then they get interpolated... I think. I may be wrong, maybe Dennis or somebody can confirm and give a more technical answer.