Alias Artifacts with Track Pan/Crop Tool

MarcS wrote on 9/21/2004, 8:50 AM

I've gotten to like the look of a black border around my videos. I typically do this by using the track pan/crop/motion tool and scaling the horizontal height from 720 to let's say 680. The vertical height is chained to reduce automatically.

What I've been noticing though is that this can throw alias artifacts into the final avi render. Diagnal lines or oblique movements of subjects will have a choppy/aliased edge that's quite unsightly.

Should uniform scaling cause alias artifact? Anybody else observe this?

Thanks,

MarcS

Comments

SonyEPM wrote on 9/21/2004, 9:16 AM

You could a) try rendering at "Best" quality (higher quality scaling) or b), if your source material permits, don't scale at all, just overlay the border using generated media.

B will result in nicer looking video and rendering should be significantly faster.

SeaJohn wrote on 9/21/2004, 9:47 AM

"B will result in nicer looking video and rendering should be significantly faster."

So does this mean that ANY scaling will result in a visible degradation in video quality, even with Best rendering quality?

Chienworks wrote on 9/21/2004, 9:58 AM

One could generalize and say that ANYTHING you do to your video will result in a degradation of quality. If you do any scaling, add any effect or filter, or do anything else at all to it, something will be lost in the processing. This is just the way the universe works.

MarcS wrote on 9/21/2004, 11:08 AM

I always render on Best quality.

Overlaying a rectangular frame done in generated media over the timeline necessarily eliminates part of the video surface. I've preferred to just scale it down.

Somehow I figured that linear, uniform scaling of clips wouldn't introduce aliasing since the picture elements are still in the correct proportion to one another. Then again, I guess that any manipulation introduces artifact.

- Thanks,

MarcS