how to avoid bending on fade

logiquem wrote on 5/23/2003, 10:06 AM

Hi all,

I have some problems with various texture in Vegas. Fading images produce horrible bending. This is especially true with clouds. This not only occurs on previews but also in rendered videos. Any ideas?

All the works is done and rendered in native DV.

Comments

bakerja wrote on 5/23/2003, 1:01 PM

What do you mean by "bending"?

JAB

logiquem wrote on 5/23/2003, 1:25 PM

Sorry for my stupid english...

Is "Binding" more appropriate?

I mean discontinuity in shades, just like viewing a 24 bit image in 16 bit, or a bad gif compressed shaded image.

Chienworks wrote on 5/23/2003, 2:29 PM

I think "banding" is the proper term ... instead of smooth gradations of tone you get distinct areas of different shades, correct?

Unfortunately video only has 8 bits/color resolution. When you fade, you're using fewer and fewer of these bits. Add in to this the compression used by various codecs and they have to give up trying to accurately represent all the different shades correctly. On top of this, most codecs are optimized for brighter areas since these are more noticeable so they let the darker areas take fewer bits. MPEG seems particularly bad at this, but any codec is going to have trouble in this area.

logiquem wrote on 5/23/2003, 2:51 PM

Ah! thanks a lot, you are right in interpreting my poor english.

In fact, i have worked a lot with a Canopus DV Raptor card, Premiere and After effects in the last year and the quality was definitely *much* better in term of image stability (flicker free) and detail rendering.

I switched for Vegas mainly because i so hated Premiere... and found Vegas promising.

I love it very much for general multimedia purpose but i wonder now if Vegas is really the tool to do professionnal NTSC work. Do i miss something?