Highlights puslate in 24p

F

Flintstone

Well-known member
I've done a few projects in 24pA (F6 on the dial with a few tweaks), and I notice strong higlights tend to pulsate, so to speak. I'm not talking about the motion strobing, I'm talking locked down cam shooting a talking head. By highlights, I mean predominantly overexposed areas such as windows that are in the frame. It is more noticeable when seen on an CRT TV, but sometimes creeps up on standard progressive computer playback. I know shutter speed is a factor in this, but what is the best way to minimise this?

Tools used: Cam: DVX100B, NLE: PPro1.5, DVDAuth: Encore1.5
 
Try setting your knee to low. This will start rolling off highlights at 80% IRE. or choose Mid if your whites look too gray. If you shoot Cinelike you won't have this option and will have to close the f stop range between the the highlights and shadows.

S Cannon
 
Were you using autofocus by any chance?

I've seen the autofocus really pump the background sometimes.


-BillP
 
Hmm, I recall a problem with PPro causing this. It was pumping up the level on every fifth frame or... argh, I don't recall the details. But try adding an NTSC Safe Levels filter to the clip and see if that helps.

Also, search the Premiere section of this forum for pulsing.
 
I think that you can also use a Proc Amp filter in premiere to bring this down, I used to have this problem as well.
 
I was using manual focus and Cinelike.

Hmm, I had some doubts that Premiere 1.5 may not be the perfect tool for 24pA. I'll try your suggestions about NTSC safe and toning down the highlights with filters.

So this has nothing to do with shutter speed then?
 
Nope it's premiere pro 1.5 not ,1 and not 2, just 1.5. I'm actually going through the same thing right now. I am color correcting using vegas, and my editor is using Ppro 1.5. He sends me the final edits, I color correct them, and print out to tape. This is driving me nuts, and I am having him either upgrade to Ppro or Vegas.
 
Downloaded PPro 2.0 and hold and behold: The problem is GONE! Now I can go back and shoot without any lurking doubts. Thanks scharky!
 
:dankk2: interesting thread.

now I just want to know:
where were you guys when i posted the same problem happening to me?????
http://www.dvxuser.com/V6/showthread.php?t=38316
grrrrr:furious3:

by the way, for pal users, it looks like it's happening evry other frame. this somewhat helps, since the higher frequency makes it less noticeable on tv.

Andrea...
 
well, ,i went back to investigate the problem to make sure the cause of the prob was premiere 1.5 in my case too.

well, it's NOT. the problem is in the raw footage as well. pretty disappointing...
i guess it's just lighting situations to be avoided...

Andrea
 
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