Jump to content


Photo

Using glass filters while shooting chromakey/color reflections

vfx chromakey color cast.

  • Please log in to reply
3 replies to this topic

#1 Roma Grushevoy

Roma Grushevoy

    New

  • Basic Members
  • Pip
  • 2 posts

Posted 22 September 2013 - 04:23 AM

Hello everyone!

I'm planning to do my first chromakey shooting, and, essentially, I've got couple of questions

 

1. Do I need to use any of glass filters to enhance the incoming quality of image ( I mean like polarising filters, when shooting outside )

2. I suggest that after litting the chroma, I might get green reflections on all objects within a frame - is this suggestion correct ? If yes - then my first question, but a bit refrased - how can I cut all the unwanted color shifts and casts ?

 

Main object's color is going to be medium gray/black,


Edited by Roma Grushevoy, 22 September 2013 - 04:24 AM.

  • 0

#2 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 20254 posts
  • Cinematographer
  • Los Angeles

Posted 22 September 2013 - 11:14 AM

The larger and further back you can get the green screen (no larger than necessary to fill the frame of course), the less it will bounce back green light on the subject.


  • 0

#3 Roma Grushevoy

Roma Grushevoy

    New

  • Basic Members
  • Pip
  • 2 posts

Posted 22 September 2013 - 04:47 PM

Thanks a lot


  • 0

#4 aapo lettinen

aapo lettinen
  • Basic Members
  • PipPipPipPip
  • 1168 posts
  • Other
  • Finland

Posted 23 September 2013 - 08:23 AM

you can control the green reflections with negative fill and/or bouncing white light to the shadows, if the object's surface is not too shiny. The shadow areas and hair are usually the biggest problem with green screen, along with the reflections.

I usually try to reduce reflections from shiny surfaces (tables, etc) , when camera is not moving much, by placing flags behind the object in critical areas, leaving just a necessary area of green around the edges of the object in places where the reflections are otherwise worst. Then, the object reflects the black surface of the flags (or any other surface: bounceboard, etc.) and does not need extensive work in keying...


  • 0



Visual Products

Paralinx LLC

Glidecam

Media Blackout - Custom Cables and AKS

CineLab

FJS International, LLC

Technodolly

New Pro Video - New and Used Equipment

Wooden Camera

Willys Widgets

Aerial Filmworks

Tai Audio

Rig Wheels Passport

Metropolis Post

The Slider

Gamma Ray Digital Inc

rebotnix Technologies

Abel Cine

CineTape

Ritter Battery

Broadcast Solutions Inc

Tai Audio

The Slider

Broadcast Solutions Inc

Media Blackout - Custom Cables and AKS

Glidecam

CineTape

FJS International, LLC

Gamma Ray Digital Inc

Willys Widgets

Abel Cine

CineLab

Visual Products

Technodolly

Wooden Camera

Paralinx LLC

rebotnix Technologies

Ritter Battery

New Pro Video - New and Used Equipment

Metropolis Post

Rig Wheels Passport

Aerial Filmworks