Minimizing aliasing in video preview of interlaced

ScorpioProd wrote on 10/30/2007, 1:02 PM
I work exclusively with interlaced projects currently.

In the video preview window on my LCD computer monitor, I see really bad aliasing when the camera or people in the shot move, as in lots of jaggies on the edges of them.

This makes sense to me since after all, the computer monitors are progressive, while my video is interlaced.

The preview out the firewire port shows properly interlaced on an NTSC monitor with no problems.

Is there any way to minimize this in the preview window so that it more accurately reflects my interlaced video? I normally run it at Preview(Auto), but even moving up to Best(Full) doesn't change the jaggies I see. Ironically, if I move to Draft(Auto), the cutting the resolution in half does eliminate my jaggies, since it's probably just showing me one field of each frame.

Are the project properties settings for deinterlace: none, blend, interpolate anything to do with this? I've tried changing them with Best(Full) on the preview and it doesn't make a difference. When does one have to set this setting, is it only when using interlaced footage in a progressive project? I leave mine set to none for my interlaced projects, is this correct?

Thanks.

Comments

farss wrote on 10/30/2007, 3:03 PM
The project settings make no difference to how Vegas displays the preview. When scaling video you really do need to specify a de-interlace method or you can get some very nasty interlace aliasing problems.
If you use the secondary display then and only then can you get a de-interlaced preview.
Most other NLEs seem to only display one field to their preview device. I've more than once had to fix problems in video from clients who don't use Vegas where there was something in that other field that shouldn't have been there. The way Vegas does it ain't pretty but it can save you butt.

Bob.