Video noise

[Joe Boland]

Hi Guys, I have the wonderful sony z7, lovely cam, again like a post that was here a short time ago, i can get quite a bit o noise in my film mostly at dancing when lights are low at weddings, i have used the 6 -9 db gain but still only ok, when i go on auto its realy bad. i had a dsr 250 before and you could use it in a barn

any help for the Irish man would be wonderful

thanks guys

Joe

[Lee Berger]

Hi Joe,
As an HD Camera the Z7 is much better in low light than it's predecessors such as the Z1 and the V1. It's still a high def camera with 1/3" chips, compared to the 250's 1/2 inch chips. If you went auto you may have experienced auto gain which can up the gain as high as 18db. I have found 12db useful in some situations, and 9db reasonably acceptable for event shooting. I shot a wedding reception last week and I was able to safely place three tungsten lights and bounce them off the ceiling. That allowed me to shoot at 0db. Some venues are not conducive to adding light. I hope this is helpful.
Lee

Oops. I got the 250 mixed up with the 300. Sorry about that.

[Don Bloom]

the DSR250 was a 1/3" chip camera. Basically a PD150 in a fullsized body. It worked great at 15db if need be but of course so did/does the 150-170. I have owned them all and frankly the DSR250 or PD150/170 is/was better in low light situations than the JVC5000 I owned which was a 1/2" chip camera. Of course some of that had to do with the lens on the JVC which was the Canon 16X, the Canon 19X was far and away better but regardless, the Z7 should be just fine at 9 in a pinch even 12 it depends on the rest of the setting you're running with, ie; shutter speed, f/stop, etc and of course are you relying solely on existing light or are you helping it with some on or off camera lighting.

[Wesley Cardone]

If you discover noise in the edit room there are various de-noise softwares that help very much in taking out the noise. One might suggest that this process could be extended to essentially increase the light gathering capabilities of your camera but I don't recommend it. Sure, you can shoot at a lower gain and collect insufficient light but then correct it in the edit room. However, de-noise is not perfect and you are probably no better off than if you just upped the gain in the first place. De-noise processing adds a huge amount of overhead to your workflow as well.

De-noise software, though, is a life saver when you are caught by surprise.

[Bryan McCullough]

2 days ago I spent the best $100 I ever have in this business. I bought Neat Video and it's incredible at cleaning up noise.

Neat Video - best noise reduction for digital video

[Wesley Cardone]

I also bought Neat denoise software and have had great success with it when I used it to save my behind one time last year. This was footage that was captured with a crushed black backdrop in the background which ate up all of the light. It requires that you get a sample profile of noise from your footage that you need to correct. You collect a profile from somewhere on your footage where you have a nearly full screen of maybe a wall or just a blank spot where ONLY the noise is present. My footage didn't really have a good blank spot. However, I used the sample profile that came with the software and it did a really good job.

[Joe Boland]

Thanks guys

Great to get help when stuck,

Lee : I know some rooms can be v dark for weddings etc, and we dont want to turn the place in to a flood lit area, and i did not know the gain could go to 18db on auto ! which is way to high, last week i used Manualand went to 6- 9 db which looked better , i also had a camera top light 100w, so worked out better,

Don: i only used the gain 6-9 i not use the shutter speed, f/stop, etc and was relying solely on existing light in the room, which was ok but .....had to use my camera light later,it looked fine on my lcd .......... but pure horse dung on a lager screen,

Wesley i might give the soft wase a shot as well. that could come in handy,


But as i was so use to the 250 shooting in near dark, the z7 just needs a bit more running,


thank you ALL for you help.

again i need to get to grips with f/stops. shutter speed.


also is there a way to turn down the gain in auto so it dont go to that when on auto. or is this a dumb Question

[Wesley Cardone]

In the menu you can limit how high the gain is allowed to go in auto mode.

You really need to stay away from this auto stuff, anyhow. It will get you into trouble so many times it ain't funny.

I recommend that you consider shooting at a shutter speed of 30fps for things like receptions. The LCD imaging is not a good representation of what your 30fps video will look like. When you think about it, 30fps is really perfect for events such as receptions. The viewer will never know you were shooting at that speed unless somebody makes a sudden move. The benefits are you don't have to up the gain as much meaning less grain in the image. If you can get less overall grain at the expense of an occasional fast-move showing up you win. In practice I have found that fast-moves show up only on rare occasions. 30fps is my standard setting for receptions.

[Joe Boland]

OK Guys I have set the agc to 15 , got a wedding to day so I will let ye know tomorrow, also downloaded the

Neat Video - best noise reduction for digital video , great bit of software,

thanks again

The Irish man

[Rob Morse]

Joe,

15 on the AGC is too high in my opinion. It sounds as though you're using the gain in manual and everything else in auto, is that correct? Neat Video is a great product but I use that when I get footage from other people, not on my own. While it is a life saver, It takes forever to render. You should be able to tell on your monitor whether the lighting is sufficient. I'm sure you know what you're doing but If you need to be unobtrusive lower your light and get a little closer. Also, using the manual settings will give you much more flexibility. I try to shoot with a maximum gain of 9 and do so reluctantly. Also, I've lowered the lighting on the LCD. I think the default is too bright and slightly misleading.

[Joe Boland]

Hi Rob, yea did the wedding yesterday,

yep, you are right 15 is to high in agc, even in the church when i zoom in on say a black suit i could see grain, so i may drop it back to maby 12- 9 and see how it goes,

Yes when i go on manual its only to drop down the gain to help me out.

and yes the default on the lcd is and i set it last night as well.



"know what you're doing" i often wonder, i have been doing weddings for years but with the old ms4 / ms5 and sony 250 you could drive it with your eys closed,full auto and away i go!

[Wayne Dear]

Hey joe,

I had this issue a few months back, looks great in LCD, but crap when you go to edit, and even more so when you veiw on a big 50-60 inch Plasma, the noise is awfull. Yes I was filming in Auto, I soon changed and now do all my shooting in manual, and as above I shoot at 6-9 and 60 fps I think, just depends on light.

I had a shed wedding last week, one light, a flood light, shooting from front to back, bridal at back, was darkest wedding I have shot in 14 years of shooting, and I have done alot of weddings, and I was like, hope this comes out ok... Shot it at 6 and 60, and it was perfect.

Also a trick I do, as the LCD can be deceiving, as it may look fine, but it isnt, I look for a black object, and that way I can see the noise clearly, then I drop the db until its perfect and none is showing, works a treat I find.

I find now though I am allways around 6-9db at receptions with dimmed lights, I do have a light for camera, but alot of people I find do not like it, and one of main reasons I bought this HDV-Z7 was for low light filming of weddings, and it does a really good job if you get your settings right. but some lights can be really good with a nice filter on them and do not become obtrusive.

[Rob Morse]

I'm sure if you told the bride the video would be much higher quality with a little light, she would tell you to go for it. At +9 db I still cringe if I can't get any additional light. Although, some people might be happy with that output.

[Dan Crowell]

Joe,

Try shooting in 30p or 24p and drop the shutter speed to 1/30 or 1/24 respectively in low light conditions as you have described. I personally would never use the gain, but on this camera I think 6db is very clean. I think you'll find the result to be very solution.

[Joe Boland]

Hi Guys, when I first posted about video noise in the z7. yea it was on auto 18!!! and i did my first wedding on this setting ,but I now use 6-9 and i feel its working out great,

Good point Dan with your point in shooting in 30p or 24p and drop the shutter speed to 1/30 or 1/24 respectively have a wedding tomorrow and will give it a go,

Great trick Wayne with the trick LCD going to give that a go to !


Thanks for your help guys

Joe............... all the ways from Ireland