Lines not straight

[Jeff Brown]

I believe that’s due to Premiere’s less-than-optimal (i.e., lousy) scaling algorithms. AfterEffects (or some other compositing app) would do better for you if you have that option.

-jeff

[Dan Plonsker]

Thanks Jeff. With AE same.
Will try another application.

http://www.danplonsker.com

[Martin Vincent]

I capture HD and output to SD, I use the over-res to zoom digitaly in my footage to make valor changes “changement de valeur” (sorry I dont know how its called in english), I zoom on faces or else. But it seems to be blurry a little is there a solution to that?

[Jeff Brown]

Dan– on reconsideration, you may just be up against the relatively low resolution of video. A 5-degree swing will take horizontals to a slight angle, and if there are fine lines, they will show artifacts.
Photoshop has pretty good scaling; try “perspective-ing” a still frame in that, and if you still see artifacts, it’s probably time to live with it or increase the swing angle in hopes of reducing the stepping.

-jeff

[Dan Plonsker]

Thanks Jeff.
The problem is that I’m trying to have small movement with the video, from 5 to minus 5, and while changing angles it’s even worse….
There must be a program that does it right 🙁

http://www.danplonsker.com

[Dan Plonsker]

Thanks Martin.
I can’t have the image blured. i’ve tried the antialiasing filter,
but it affects the whole image, not just the edges.

http://www.danplonsker.com

[Vince Becquiot]

Dan,

This is a very common aliasing problem that we face constantly, but we often don’t notice it because it’s taken care of for use automatically, by antialiasing.

There is a way to replicate that on video edges, I use a little trick for that, and it works great.

1- Bring in the footage in After Effects, set your perspective.
2- Apply a mask (Layer > mask > New Shape)
3- Set the mask feathering to 1 pixel (more pixels may be needed depending on the angle of rotation)
4- Set the mask shape expansion to -5

Seems simple doesn’t it ?

You can play with settings there, the lower the resolution the more pixels you’ll need in feathering, but that should take care if it.

Cheers,

Vince

[Dan Plonsker]

Thank you Vince. your trick sure works!
I was playing with masks in PP but with your idea AE does a much better job. It solves the problem, but with somewhat fuzzy edges (I had to set the mask feathering to 3). Anyhow, I will settle with that.
Now I have to render it back to PP with alpha channel.
My files are DV avi’s. Is there a way other than using a QT file?

http://www.danplonsker.com

[Vince Becquiot]

3 pixels sounds like quite a bit. If you are looking at it on a computer screen, make sure the preview is set to 100% or it will looks worse than it really is. But as I said, it depends on the source resolution.

As export, I usually use QT animation with alpha, it should be very fast with just a mask.

Cheers,

Vince

[Dan Plonsker]

It’s going to be projected on a big screen, so 3 pixels seem like a must. QT animation is what I tried and it was OK.
Thanks again,
Dan