weird anti-ailiasing when panning

egproductions

egproductions

Veteran
i am working with still in a dv25 timeline 29.97 lower field. there is some anti-ailiasing because of how hihg res the pictures are but all of a sudden whenever i try to use the motion effect to pan to the top of an image it gives horrible horizontal lines. When i export this clip it looks fine when looking at it outside of premiere but when i plug it back into premiere the motion still looks wacky. My preview mode is set to highest quaity. My aspect ratio in the timeline is set for 16:9 but i am doing a software aspect ratio conversion so that i can montior my 16:9 footage on a a 4:3 television. Its worked fine in the past on regular footage but i dont get why its happing now. Also when i set the aspect ration conversion to none (for previewing) there are no signs of the lines but then i have the issue of it looking squezed on my television
 
I think "anti-aliasing" is the reduction of those jaggies. Not the jaggies themselves.
Your picture looks all jittery and jaggie because you scaled it down so much, right? Try opening it up in a picture editor and scaling it down there as much as you can (so you can still pan and zoom etc in Premiere), then exporting it. I think the trick is to scale down pics in Premiere as little as possible to avoid the jaggies.
Also, in PP1.5, somewhere in the menu that pops up when you right-click a clip is an option called Flicker Reduction. In 2.0 I think it's in the Motion Settings.
Hope this helps!
 
I realized what the issue was. teh anti-ailiasing is definitley and issue to look out for but the problem was with teh software aspect ratio converter. The software aspect ratio converter works fine in progressive mode however when you you are editing interlaced and there is enough motion to have a frame that shows interlace lines or is in betwen frames than the software squezze does a horrible job. It isnt a problem when the motion is slow enough but you can try it yourslef. Just grab some footage that is realativey moving or would cause a motion blur at 60i and then put it in a 16:9 project then do the software squeze and on a television you will see that it gets really messed up looking. Luckily this is just a previewing feature and wont effect the final export.
 
I'm not sure what your doing, I do this all the time and you have me confused?

I believe the "jaggies" your talking about are from viewing an interlaced image on a progressive monitor, the fields are "exaggerated" in motion whether your panning and scanning a still image or live action video.

So if you are doing some sort of image filtering to lesson this effect and then view the result on a CRT I would imagine it would look like crap. But if you ignore the interlacing on a Progressive display and view the output on a CRT it should look fine.

I'm also not sure of what you mean by a software aspect ratio converter? If you convert [scale] a 4x3 to a 16x9 or visa versa you will be squeezing or loosing 20% of the vertical axis. I am not aware of any software that can correctly convert from one aspect ratio to the other.
 
The reason you are probably confused is because you either dont edit using premiere pro 2.0 or never came across this new feature in it. When you go to your playback setting via the drop down menu on the upper right side of the monitor window in prmiere there is an option to convert the aspect ratio of your footage. So if you are editing 16:9 footage and output via firewire to your deck or camcorder and then do an analog output to a regular television that will squeze a 16:9 source the software aspect ratio converter will automatically letterbox the 16:9 footage to 4:3 (this is more taxing on the CPU and you are lossing quality as you have mentioned but it is just for playback purposes) so the issue is that when you use this letterboxing of 16:9 footage on interlaced signals it creates messed up lines becasue of a crappy letterboxing of the footage when there is high motion.
 
I guess. All I edit with is PPro2. I have done a lot of mixing formats SD 4x3 into an HD etc, all with panning and scanning stills and have never had this problem.
 
It would probably a good idea on my part to install Pro 2 on another computer to see if this probablem occurs there also (maybe its just my computer) But i get the feeling its just a bad letterboxing much like a dvd player will do with 16:9 footage when outputed to a a 4:3 television. Ideally the dvd player would be hooked up to a16:9 television so that it can output eh true 16:9 video and not a letterbox whihc can sometimes cause anti-ailiasing problems
 
whenever i try to use the motion effect to pan to the top of an image it gives horrible horizontal lines.
Click to expand...

i believe you are reordering the lines of the scan...if it's interlaced. you might need to right click and deinterlace that way you won't get the lines. that also goes if you are resizing the letterbox.
 
Never trust Premiere's preview, real-time preview, or preview on a monitor. It's always off. You've got to Export/Movie to really tell what's going on, and usually everything is tip-top when you do so.
 
Joshua Provost said:
Never trust Premiere's preview, real-time preview, or preview on a monitor. It's always off. You've got to Export/Movie to really tell what's going on, and usually everything is tip-top when you do so.
Click to expand...
I have no love for Adobe, so I'm not trying to talk anyone into Preomier, but why do you say this?

Using the FX540 graphics card I have a compnent HD output, with Y/C out for SD and DVI out to my Dell 24" display and don't have any problems viewing Premiers real-time preview.

I'm using AspectHD for HDV so there's a bit of a shift when it converts from the RGB overlay to YUV but other than that its great.

What am I missing?
 
You must log in or register to reply here.
Back
Top