VIDEO NOISE quick tips requested

P

PIMP

Well-known member
I am getting video noise even when I use acceptable amounts of light. What am I doing wrong? Can you guys reccomend a basic tip on avoiding grain and noise. Its hard to tell on the crappy litttle LCD screen. Like i filmed a person wearing a black coat. And that person was very well lit yet i see the video noise all over her jacket.
what gives?
 
sounds simple but check your gain switch..maybe it got bumped or switched on accident....start simple right(:
 
If you don't like grain use another camera. Very little you can do to get rid of the grain completly. I rather like the noise look after watching Miami Vice.
 
Turn detail coring up. However, the cost of this is a softer picture. Try a slower shutter speed. If you are shooting at low light, and progressive 25 or 24p, you can take the shutter down to 25/24. Beware that the picture looks softer bellow f4.
 
What are you viewing on? HD LCD monitor amplify the noise in the signal making you believe it's noisier than it actually is. Try a CRT or DLP projector to get a better idea.
E..
 
So is VIDEO NOISE acceptable in this camera?

I notice this in black areas mostly. I suspect that the LCD screen shows more video noise then there really is. But in my broadcast monitor i see it as well. I followed BARRY GREENS book. Yet i still see it no matter what i do. I have the gain turned all the way down and i still see noise.

This is what i set it to.
-cinelelike v

- color matrix normal

- detail level low

- detail coring - low

gain set to 0
 
Why dont you post a pic of this "noise" So we can see what mght be or might not be acceptable. A Picture is worth a 10000000 words, and will helps us to judge the issue.
 
Hi,

You say an acceptable amount of light, but that is defined by what, acceptable to you? or to the camera? How about a light reading, how many lumens do you have on the scene? What sort of lights do you have oris is just available light. This would help us understand the sort of light that is giving you a problem. Blacks will always get noisy first regardless of small HD camera, so with all of the 1/3" cameras you need to light the dark areas more like they do for film, it just has to look dark.

Also if you could post a Frame Grab that would be useful in everyone helping out here.

Best,

Jan
 
Turn down the master pedestal (maybe you can crush the blacks to get rig of the noise in her black jacket).

Jan summed it up.

You probably need more ambient light - the range between highlights and black can really only be a few stops difference.
 
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I've noticed the same thing with footage I shot with the HVX200, as well as the DVX 100. One scene was exterior wide great light- just a tad overcast- shooting with HVX200 - didnt see it on the LCD but noticed it in post on my 23 inch apple dislpay and my Sony 19inch crt production monitor..) Talked to a nother DP friend of mine and he asked if had the gain on - valid qusetion, first possible variable. But no. Was is just the sheer amount of detail in the shot? He added that a place he shoots for no longer lets him shoot 24p, frame mode, or 30p. Just 60i. The editors say this is the cleanest picture they can get - and if they want the "film look" they can bullet it.
So could it be exposure/small chip/frame rate/shutter combo?
I own a dvx 100 and I like to shoot at 24p usually with a shutter of 48 or 60. If I use an SDX 900 - usually shoot with the shutter off and havent seen this problem with the higher end 2/3 chip wondercam...
 
Since the HVX200 always images and processes things progressively internally, there is really no penalty to using it, or advantage to not using it. But the HVX is supposed to have a stair-stepping problem with SD 480i, something I have never even used myself with this camera.
 
This is not only the camera but the codec, I shoot a lot of Vari and it has similar issues. Even in great light, any shadowy reds, wines, dark areas, etc can be noisy. SDX is actually cleaner, I attibute that to DV50.

To cover the noise, dont use the cine color matrix. Also, to mask noise, coring needs to go UP. Crushing the blacks can help.

The ONLY way to be 100% noiseless is to bathe everthing in flat light which is generally not flattering. Like every camera, you learn to work around the issues.



ash =o)
 
HD is inherently noisy. The blue channel is the worst. I have had some success using "remove grain" in After Effects. This is one of the downsides to HD, especially the lower-end cameras.
 
AshG said:
This is not only the camera but the codec, I shoot a lot of Vari and it has similar issues. Even in great light, any shadowy reds, wines, dark areas, etc can be noisy. SDX is actually cleaner, I attibute that to DV50.

To cover the noise, dont use the cine color matrix. Also, to mask noise, coring needs to go UP. Crushing the blacks can help.

The ONLY way to be 100% noiseless is to bathe everthing in flat light which is generally not flattering. Like every camera, you learn to work around the issues.



ash =o)
Click to expand...
Care to elaborate? I have been pulling out my hair over this. Thanks
 
On the other thread about noise a couple of people told us to use B.Press. We tried it and the noise didn't disappear completely, but it made a big difference. Better than using Cine-V.
 
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