Really bad Chroma Noise on 100A

rbilsbor

rbilsbor

Well-known member
Just got back from a night shoot in 30p, had to bump gain up to 6-9db at times. While shooting the chroma noise, especially on blue colors, looked really bad. I was hoping it was just the LCD, but when I got back and looked at it on the production monitor, it's there on tape--all of it. And it looks really bad. Once you bump the gain up to 6db, is that much chroma noise to be expected? My old PD150 didn't have that problem, so I'm trying to figure out if this is normal--obviously, with my old 100, it didn't have gain-up in progressive mode, so I can't compare it to that either.
 
Re: Really bad Chroma Noise on 100A

any sort of gain is bound to add some chroma noise, but if you had cinegamma on in the low light conditions, your just asking for trouble. especially in the progressive mode cause it needs more light. honestly i still dont understand why people were requesting the things like gain up , and slow rear auto focus to be put back in the dvx with the "A" version after it was dismissed from the original dvx100 prototype to begin with. the cam is a pro line camera, and is meant to be used under profeesional conditions. nobody would ever shoot film in somthing that dark , but oh well.. its in there now.. joy to the world!
 
Re: Really bad Chroma Noise on 100A

Yeah, I had it on the Enriched setting with B_Press gamma. Not wise, but it was run & gun (thus no lights), and probably not legal. Anyone know of a way to get rid of Chroma noise?
 
Re: Really bad Chroma Noise on 100A

You can try tweaking the gamma curve on the blue channel only, might help.
 
Re: Really bad Chroma Noise on 100A

rbilsbor:Yeah, I had it on the Enriched setting with B_Press gamma.  Not wise, but it was run & gun (thus no lights), and probably not legal. Anyone know of a way to get rid of Chroma noise?

Okay, just so that you know what you did, and ended up with the result you have, you put extra color saturation in, and compressed the blacks with the Press Gamma setting. You would have been better off had you used the Cinelike D or even V, along with less color saturation. With the run and gun I would have used the Cinelike V. And before I used any gain I would have upped Master Ped a couple of clicks.

Perhaps there is a filter somewhere in the software that might filter off the noise, but i would not know. I am not an editor.

Good Luck,

Jan
 
Re: Really bad Chroma Noise on 100A

Thanks Jan! First off, thanks for posting on this board and others over the past couple of years... You've definitely helped me feel better about Panasonic's commitment to us "independent" filmmakers and videographers.

I think I'll try reducing gain on the blue channel in post. The Scene File I had set up was one I made for daytime shooting and I didn't have time to change it (F4 was my 30p setting, and none of the others were set up to be 30p), so that's what I'm stuck with. In fact, that was probably the worst combinitation of Gamma (B_Press at night, with -2 Master Ped) and Matrix settings (Enriched) possible. Oh well! Fix it in post!
 
Re: Really bad Chroma Noise on 100A

Last night I came across a plugin for Vegas that was developed originally for virtual dub.  Basically it is a smart blur.  You can conrtrol the diameter and the threshold of the blur.  It will blur pixels that are close in color/radience togother but leave edges sharp.  THis could take care of some of your chroma noise, if not it's a cool plugin to have none the less.
here's the link

http://mikecrash.wz.cz/vegas/vegas.htm


BTW it's free
 
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