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Canon Cinema EOS Camera Systems
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Old December 11th, 2012, 03:31 AM   #1
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Anyone have any idea what these are? Please help!!

Hi,
So, I've been shooting on my c300, and noticed these weird gamma-artifacty scan line things in certain parts of the frame whilst shooting in this mental health ward/hospital. I'm shooting at 24p and 1/48th. Shooting c-log. Logging and transferring mxf clips into fcp 7 as prores. Here are some ungraded pictures. You can see what I'm talking about in the lower right part of the frame in the first pic, and on the back of the subject's navy fleece in the others. It's almost like a mix between mild scan lines and compression artifacts. Any info would be MUCH appreciated. Thanks, all!
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Old December 11th, 2012, 05:06 AM   #2
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Re: Anyone have any idea what these are? Please help!!

I saw something like this last week on a dark neutral grey background we were using for some interviews. In FCPx it appeared almost like a weird tv scan sync problem, as the screen pulsated in the areas with the background. It was less visible in quicktime, but there was definitely some linear noise that I've never really noticed before. I tested at a variety of iso from 320 to 1250, and it was present throughout the range.

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Old December 11th, 2012, 07:32 AM   #3
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Re: Anyone have any idea what these are? Please help!!

Well, shooting in a mental health ward, the only thing that comes to mind is it's gotta be ghosts.
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Old December 11th, 2012, 08:15 AM   #4
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Re: Anyone have any idea what these are? Please help!!

Did you adjust your shutter to the hrz rate of the fluorescent lights in the hospital?
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Old December 11th, 2012, 11:19 AM   #5
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Re: Anyone have any idea what these are? Please help!!

were you shooting 24P or PF?
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Old December 11th, 2012, 11:54 AM   #6
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Re: Anyone have any idea what these are? Please help!!

Looks like enhanced noise in underexposed area associated with scan lines resulting from florescent lights.. Had this occur with the 5DII in florescent lighting. Wondering whether your conversion process added to the noise. What about raw material. Same issue ?
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Old December 12th, 2012, 12:31 AM   #7
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Re: Anyone have any idea what these are? Please help!!

Hey, guys, thanks.

Yes, I shot some stuff at 1/60 to see and it didn't make a difference.

Everything is shot at 24p. I got the same thing when I was shooting this exterior at night.

What the hell is up with this linear noise?!?

Thanks for the help

cl
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Old December 12th, 2012, 12:53 AM   #8
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Re: Anyone have any idea what these are? Please help!!

Chris B- checking raw footage now
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Old December 12th, 2012, 02:52 AM   #9
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Re: Anyone have any idea what these are? Please help!!

As much as discovering the little details of a new camera w.new sensor etc is important and I don't blame anyone...I can't see a damn thing!
Is it really obvious in motion? If not I don't think there's much to worry about (so long as the audience is watching on a relatively well calibrated screen. Not something you want to bet on I know)
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Old December 12th, 2012, 11:00 AM   #10
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Re: Anyone have any idea what these are? Please help!!

I brought up the mids so you can better see what I'm talking about here.
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Old December 12th, 2012, 11:02 AM   #11
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Re: Anyone have any idea what these are? Please help!!

@ Murray- It's not that noticable, but I cant say that is putting me at ease!
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Old December 12th, 2012, 11:18 AM   #12
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Re: Anyone have any idea what these are? Please help!!

I have had an issue with this too!

As below it was when shooting an interview against a dark grey gradient background. I was using selective colour correction and the effect became fairly noticeable.

Unfortunately I am unable to post the clip as the film is not yet release but I may be able to take a still of just the background if I can find a suitable section. Lighting was Kino Divas and Litepanels LED heads shooting at 25p. I think the issue is coming from the sensor.
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Old December 12th, 2012, 11:58 AM   #13
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Re: Anyone have any idea what these are? Please help!!

thanks, Mike, please post a still here when you can.
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Old December 12th, 2012, 02:12 PM   #14
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Re: Anyone have any idea what these are? Please help!!

Quote:
Originally Posted by Chris Leising View Post
@ Murray- It's not that noticable, but I cant say that is putting me at ease!
Cheers for the pic.
Don't worry. I'm one who would never buy an aperture grille CRT back in the day just because the two little suspension wires would bug me no end. So I know what you mean.
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Old December 12th, 2012, 03:13 PM   #15
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Re: Anyone have any idea what these are? Please help!!

Here's a little clip of it. I brought up the mids so that you can see better what's going on.

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