Jump to content




Photo

Blackmagic - crushed blacks


  • Please log in to reply
4 replies to this topic

#1 David Schmüdde

David Schmüdde
  • Basic Members
  • PipPip
  • 27 posts
  • Director
  • New York City

Posted 03 September 2014 - 08:29 AM

Hello everyone, I'm not getting what I expect to see from my raw file. I suspected it was a colorspace issue, but I don't see any other people having the same problem. Here are two still photos, from the exact same night, with the exact same settings.
 
Prores looks as I expected it:
 
prores.png
 
Raw looks to have a color temperature issue (no problem). Even worse, it is grainy and the blacks are crushed. 
 
raw.png
 
I take it into Resolve and there just isn't much information in the black. It’s about a stop and a half under exposed at 1600, but that’s the amount of light we could afford to rent. I thought I may be looking at it in the wrong colorspace but I’m seeing no indication. Any ideas?
 
Thanks,
Schmuüdde

  • 0




#2 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 18789 posts
  • Cinematographer
  • Los Angeles

Posted 03 September 2014 - 09:22 AM

Looks like it has been double-LUT'ed by mistake, a Rec.709 LUT on top of Rec.709
  • 1

#3 Will Montgomery

Will Montgomery
  • Sustaining Members
  • 1922 posts
  • Producer
  • Dallas, TX

Posted 03 September 2014 - 10:41 AM

David's right, in Resolve it's easy to accidentally do this...the LUT can be applied in several places that allows for a doubled LUT. I'm not an expert but check the footage in the media pool and then in the timeline; LUT's can be applied in both places and you only want it one.


  • 0

#4 David Schmüdde

David Schmüdde
  • Basic Members
  • PipPip
  • 27 posts
  • Director
  • New York City

Posted 03 September 2014 - 10:57 AM

That's just the tip I needed. I've never shot with a Blackmagic and was unfamiliar with "BMD Film". It was indeed double Rec.709'd. I viewed the sequence as BMD Film instead and that image aligned with my expectations. 

 

You're brilliant, thank you.

 

Edit: 

 

Oh, and Will, just saw your post -- that's exactly what it was. Thanks!


Edited by David Schmüdde, 03 September 2014 - 10:58 AM.

  • 0

#5 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 18789 posts
  • Cinematographer
  • Los Angeles

Posted 03 September 2014 - 11:03 AM

I've seen them make that mistake in some of the top D.I. suites in Hollywood so don't feel stupid...
  • 0


Aerial Filmworks

rebotnix Technologies

Zylight

CineTape

Broadcast Solutions Inc

Abel Cine

Willys Widgets

Visual Products

Pro 8mm

Glidecam

Ritter Battery

CineLab

Rig Wheels Passport

The Slider

Paralinx LLC

Tai Audio

Technodolly

Paralinx LLC

Glidecam

Technodolly

CineLab

Aerial Filmworks

CineTape

Visual Products

The Slider

Tai Audio

Broadcast Solutions Inc

Willys Widgets

Pro 8mm

rebotnix Technologies

Rig Wheels Passport

Zylight

Abel Cine

Ritter Battery