Rakesh Malik
To be honest, I'd guess that you might be dealing with nothing more complicated than under-exposure here. It's a common thing in slow motion footage from people who haven't tried it, because it's easy to underestimate the difference in shutter speeds. You're looking at 1/800th of a second (1/1600th if you're using a 180 degree shutter), which is a huge difference from the standard 1/48 of a second.
Plus, the areas in direct sunlight aren't showing the fixed pattern noise, which reinforces my theory that you're seeing underexposure.
Rakesh Malik DoP/Colourist, Vancouver, BC
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Director of Photography, Colorist
On Fri, Apr 2, 2021 at 8:32 AM Art Adams < aadams@...> wrote:
Hi Cynthia-
If there’s enough IR pollution then yes, the blacks would be contaminated along with everything else. At lower levels only fabrics and certain materials will noticeably change color.
In this case, as Andrew Hunter points out, it’s probably fixed pattern noise, so an IRND wouldn’t help.
Generally, though, a filter is going to affect all the light reaching the sensor, so anything that it does to the shadows will also be done to the highlights.
-Art
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From: cml-raw-log-hdr@... <cml-raw-log-hdr@...> on behalf of Cynthia Brett Webster via cml.news <cyndustries.mail=gmail.com@...>
Date: Thursday, April 1, 2021 at 11:54 PM
To: cml-raw-log-hdr@... <cml-raw-log-hdr@...>
Subject: Re: [cml-raw-log-hdr] Wave-Freefly Hi Speed Camera
Would shooting through IRND Filters help to even out the blacks reaching the sensor?
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On Thu, Apr 1, 2021, 12:21 PM Art Adams <aadams@... wrote:
Hi Andrew-
You’re thinking about black shading, not black balance. Black balance will just make sure black is black. Black shading is about eliminating noise and fixed patterns.
-Art
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From: cml-raw-log-hdr@... <cml-raw-log-hdr@...> on behalf of Andrew Boulter via cml.news <andrew=andrewboulter.com@...>
Date: Thursday, April 1, 2021 at 12:06 PM
To: cml-raw-log-hdr@... <cml-raw-log-hdr@...>
Subject: Re: [cml-raw-log-hdr] Wave-Freefly Hi Speed Camera
Yes, sorry about the examples, they are not great, here’s one more, I have increased the brightness and raised the shadow areas just to so you can see the pattern. I hasten to add this is only to see the lines, forget the colours etc. One of my thoughts was
that its to do with a black balance, which isn’t possible, I then thought perhaps the temperature of the sensor might be an issue, I know when shooting Phantom some techs have told me they want the camera to ‘warm up”
My main question is , what is producing the pattern, obviously the sensor, but what part of it and why?
UK based but thanks to Covid, currently in Dubai for the foreseeable
On 1 Apr 2021, at 19:25, Colin Elves <colin@...> wrote:
I agree 100% with Alister: the frames are too small to judge (😃) but my initial assumption would be that it’s fixed pattern noise. Most cameras address this with a black balance. If that’s not an option here
you’ll need to do it in post.
Colin Elves
Director of Photography
Back in Brussels
On 1 Apr 2021, at 20:10, Andrew Boulter <andrew@...> wrote:
Thanks Alister, seems I forgot to mention one important thing, it was lit with sunlight alone, so its not that.
Andrew
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