Weird Noise Advice

[Charlie Garcia]

Hi all,

It's been a while since I havent posted here, although Ive been reading forever. Unfortunatelly, I have a sad reason to post again..

Just finished shooting a project on the RED, and the image has this weird patterns of noise.

-Its yellow and magenta, very sharp, and it dances around
-It happens only on the right side of the frame
-When opening/closing exposure, the noise would phisically go up and down and sometimes disappear
-It happens in objects with very same color gradient (like the sky, mountains, the road..)

Here uploaded there is an example of it. It pretty much happens in all shots, sometimes more noticeable, sometimes less... you can see it on the up right corner.

Im just trying to figure out what it is, and start investigating what options we have to fight it... any help would be much appreciated!

Thank you all in advance!

Carlos

 

[Emyr R. E. Pugh]

Charlie, is this on your R3Ds or just on the LCD? Do you see it on any of the Test Signals?

It looks very similar to a problem we had earlier this year. We were getting weird noise on the LCD which was shifting around when opening or closing the aperture as you described. The colors we were getting on the screen were the exact same colors that were showing up on the Test Signals in camera (seen most clearly on the Luma Ramp).

Have a look at http://www.reduser.net/forum/showthread.php?t=43312 for a description of that problem.

If that's what it is, and I sincerely hope it's not, then your LCD might be about to break down - ours eventually went brilliant white and that was the end of that.

 

[Charlie Garcia]

Emyr,

Thanks so much for your reply. Unfortunatelly, this thing is everywhere. it was on the LCD, also on the 17 inch monitor out, R3Ds, quicktime proxies... everywhere i look, i see it, mocking me :sosp:

My concern now is post solutions to something that we have all over our footage, the actual camera package was a rental that i hope to not see again, ha.

Thanks either way though!

 

[David Battistella]

Charlie,

I am sorry to hear about your problem. But you are saying you saw this while you were filming?

What steps did you take to correct this?
-reboot?
-black shading calibration with camera at temperature?
-call RED (who can be very helpful)

I see that you need a fix to the problems but I am surprised you would not have taken action while in the field.

David

 

[Charlie Garcia]

Hey David,

Thanks for replying. I saw this halfway through, and we definetelly did all of the following you've mentioned. We were in the middle of the desert, more than 3 hours away from LA, also dealing with other circumstances that didnt allow us to go back and take a deeper look, otherwise we would have.

RED was very helpful to the extent they could, but they were not sure what this was, nor how we couldve prevented it. We followed their suggestions, Black shading or even going back to factory settings didnt work either.

 

[David Battistella]

Hey David,

Thanks for replying. I saw this halfway through, and we definetelly did all of the following you've mentioned. We were in the middle of the desert, more than 3 hours away from LA, also dealing with other circumstances that didnt allow us to go back and take a deeper look, otherwise we would have.

RED was very helpful to the extent they could, but they were not sure what this was, nor how we couldve prevented it. We followed their suggestions, Black shading or even going back to factory settings didnt work either.

Man.

I feel for you. You might be able to use neat video to fix this, but it really works on uniform areas of noise. It might be worth a try, but it seems that it's going to take some real work to fix that problem.

were you able to ever reproduce this?

Did it ever get resolved?

david

 

[Mark Stock]

What camera build are you on?

 

[Charlie Garcia]

It was build 21. The camera itself was pretty new, like 40 hours of usage or so...

 

[Charlie Garcia]

What camera build are you on?

I had been asked that question before regarding this weird noise, is it just a generic question to have all the information, or is there any connection between the build and some potential problems like this one?

Sorry to insist, I am just hoping to find at least a possible answer as to what it is and how to fight it...

Thanks again

 

[Frank Cueto]

Have you tried debayering at FULL?

 

[Jannard]

Did you tell the rental company? Is the noise always in the same place on the frame? Make sure to tell brent@red.com the serial number and where you rented it.

Jim

 

[Charlie Garcia]

Thanks again for your replies!

Have you tried debayering at FULL?

Yeah, still there...

Did you tell the rental company? Is the noise always in the same place on the frame? Make sure to tell brent@red.com the serial number and where you rented it.

Jim

Thanks for your reply Jim. The noise is always on the right side, yes. It was from our school, they are already working on the camera, while we try to figure out the noise ourselves... have you ever seen anything similar?

 

[Rob Ruffo]

Never seen this on Red, but once on an F35.

We made two layers in AE with a mask that separated noisy parts from clean parts. We then Neat video-ed the noisy parts.

We also shot a uniformly lit grey card with the same broken camera, before it was fixed, and used that image to inform Neat video on the pattern for profiling, and to inform the exact position of the sensor fail areas.

Where that didn't work we blurred, tinted, etc. the noisy parts.

My heart goes out to you.