Noisy Colors

P

PIMP

Well-known member
Has anyone noticed certain colors display more video noise then others. I was filming an actor in front of a wooden wall and the background was extremely noisy. Darker browns display noisy images. Also i filmed a metalic grey foam board and the image had much noise but the talent in front of it was fine.
 
No one's replied to you, but I had the same problem with a shoot I did yesterday. I was extremely unsatisfied with my first HVX footage. I've spent over 2 years shooting on DVX, and honestly, my DVX footage looks better lit than my HVX footage does.

The HVX is just bigger. Bigger and full of way too much grain.

I was shooting 1080i24p, however, and mayhaps that has something to do with it. never had that issue with the CineAlta. Then again, maybe our settings were way off.

That can happen when you're first using a camera.
 
couple of questions

couple of questions

what are your scene file settings? Were you shooting wide open? Is there a possibility those areas were very underexposed.

I'm not expert so I am just offering advice.

One tip I read that helped me with overall grain is to hit the zebra button and put it in marker mode. Put the lens cap on so that there is no light hitting the sensor. The percentage meter reading from the marker setting should read 0%. Usually before you adjust settings it will read 2%. Black should read at 0%. So then you can adjust your master ped until it reads 0%.

I would also think that maybe if your color levels are too high and it is trying to create color in low light situations.... it might appear as grain. Just a few thoughts to play with.

It is a noisy camera it eats light. I usually keep my master ped at -7. In the cine modes you have to have higher light levels than the dvx needs.
 
The red channel on the HVX has the most compression, hence, the most noise. Try to avoid red when you can. If you want a red gel on a light consider doing it in post instead. I did a test with the reddest possible gel I could find and it looked horrible. It was so compressed it wouldn't even look good downrezed for the web. Blue, however, looked sweet.
Exposure is key as well. Avoid 20% and lower. Lighting is all about ratios so light things a little brighter and drop it down in post.
There is also some good tid bits about lowering the noise factor in Barry's HVX book.

Ciao
 
I am a new owner of the camera and my fist problem with the camera has been grain.
Also I was shooting someone in a extremely well lit room wearing dark clothing. And the clothing had so much noise. I wasnt using any gain. Does anyone have a solution for this problem?
 
i am viewing my footage through a dvd on my normal sd television.

so if lower the pedestal that would create more noise?
 
I know when I view video on my laptop in QuickTime, it looks very rough and grainy So much so that it looks like the gain was set to +18 or something.

However, when I play it out to my HDTV either via my Powerbook or the camera itself, it's clean as a whistle.
 
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