Interlace flicker on or off?

awesomesean

awesomesean

Active member
When you have video and pictures mixed together would you check the box to reduce interlace flicker?
The video looks great but the pictures have some spots where they look wavy when playing back after being rendered. any ideas?
 
Re: Interlace flicker on or off?

Wavy on the computer screen or wavy on an NTSC (TV or otherwise) monitor? (And what does "wavy" mean, anyway?)

If it's wavy on the computer screen, don't sweat it just yet. The computer's resolution is much higher than that of the TV (not to mention being progressive), so you'll see interlace artifacts on it that you won't on a TV screen.
 
Re: Interlace flicker on or off?

Wavy meaning like parts of the picture will have a crawl like effect. Minimal but I notice them. And you don't really see them on the computer but when previewing on ntsc tv.
Thanks David for the response
 
Re: Interlace flicker on or off?

You're describing exactly what happens when the source material is too high resolution for the interlaced display. Definitely choose "reduce flicker" on those clips displaying that artifact.

That artifact is also what can happen on certain material if shot in THIN line detail, and is why the option exists to shoot in THICK.
 
Re: Interlace flicker on or off?

so if I am scanning pics, what resolution would you use? Artifacts I think is a good word to use i think. Noticed this problem big time in premiere but switched to vegas hoping it was the program(premiere). So using a lower quality picture would get rid of this? I have been scanning my pics as bmp. files at 600dpi. Wrong?
thanks Berry. Any other suggestions. Should I reduce interlace flicker on the entire video and pictures like select the entire timeline and reduce interlace flicker?

p.s. What is going to be the difference between thin and thick line detail and what does it do. I have a dvx100a
 
Re: Interlace flicker on or off?

600dpi? wow. The only reason you would want your photos scanned at that high res is if you wanted to be able to zoom in and see sombodies individual nose hairs. If your scanning for video, use 72dpi if you don't need that kind of resolution. Also, if you are using photoshop CS you can scan at 640x480 @72dpi, then use CS to convert it to dv non sqare pixels and save yourself an extra step in Vegas.
 
Re: Interlace flicker on or off?

The resolution you scan at is irrelevant, the problem is that there's too much detail in the picture for an interlaced display to properly represent. So you have to reduce flicker on those specific pictures that are giving you the problem.

Thick & thin has been discussed to death on this and other forums... somewhere we should gather a FAQ. Basically thin gives you the ultimate highest resolution, higher than a television can display -- so you may get flickering lines. Thick blends the lines together a little to eliminate that problem.
 
Re: Interlace flicker on or off?

what happens if you check the box to reduce flicker and re render and it is still there?
 
Re: Interlace flicker on or off?

took scharky's advise and changed the resolution to 72dpi and that fixed it. With 600dpi checking the box to de interlace didn't fix the crawling effect on the pics. Resolution must be to high for tv.
This group is great Thank you guys!!!!!!!
 
Re: Interlace flicker on or off?

As Barry indicated, sometimes with a large picture that you're panning around in, even 72dpi will create fine detail artifacting, particularly with horizontal/near horizontal lines. I find that applying a small bit of vertical blur in Vegas (0.001) will solve the problem without much detectable softness.
If you are moving into or out from small areas of a large pic, 300dpi will give you decent resolution when zoomed in.
The "reduce interlace flicker" setting in Vegas doesn't really help in this situation.
Hope this helps.
Ken
 
Re: Interlace flicker on or off?

I did notice that at 72 dpi, the pictures look a little soft on the final video. I might try 150 or 300 dpi and try again
Any other suggestions?
 
Re: Interlace flicker on or off?

To basically answer the same as Barry but a little dumbed down, The problem with hi-rez images isnt necessarly the number of pixels, but the width of detail in the image, more accurately the width of the lines. Just like when you try and use a really small font for video, thin lines start to "walk" on NTSC displays, because they are thinner than the TV can handle. If you lower the res down but the lines still are too detailed (skinny) you will still see this effect. As mentioned, a small vertical blur or similar FX can solve the problem, or an unsharp (less sharp) filter will work as well.
 
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