Jump to content


Photo

Printer Lights


  • Please log in to reply
4 replies to this topic

#1 Sebastien Testeau

Sebastien Testeau

    New

  • Basic Members
  • Pip
  • 1 posts
  • Other

Posted 29 July 2010 - 01:20 PM

Hello

I am trying to find how to convert printer lights (1 to 50 RGB values) to an Offset of a color decision list.

I did a simple transfer fonction, but it doesn't seem to work. Color = (Print_light - 25)/25

So, for RGB = (34, 32, 29), we have a ASC CDL like this:

TITLE: Some title here
001 A018931_M01 V C 01:00:00:00 01:10:16:04 01:00:00:00 01:10:16:04
*ASC_SOP (1 1 1) (0.36 0.28 0.16) (1 1 1)

We don't have the values for slope and power, so we just set it them to 1. But the results are not good at all...

Thank you!
  • 0

#2 John Holland

John Holland
  • Basic Members
  • PipPipPipPip
  • 2273 posts
  • Cinematographer
  • London England

Posted 05 August 2010 - 11:35 AM

Err good luck with that what ever you are trying to do !
  • 0

#3 Robert Houllahan

Robert Houllahan
  • Sustaining Members
  • 1626 posts
  • Industry Rep
  • Providence R.I.

Posted 05 August 2010 - 10:38 PM

Err good luck with that what ever you are trying to do !



Yeah ... trying to make a correlation between a CDL and a LAD? Or something? What is the question again? Are there known knowns? and known unknowns? Or maybe just something nobody knows?

-Rob-
  • 0

#4 Simon Wyss

Simon Wyss
  • Basic Members
  • PipPipPipPip
  • 1494 posts
  • Other
  • Basel, Switzerland

Posted 29 August 2010 - 08:30 AM

We don't have the values for slope and power, so we just set it them to 1. But the results are not good at all...

Is it any wonder?

Look, different films react differently with varying amounts of light. They react more or less in a linear fashion (simple black-and-white positive print stock) or with wild curves when plotted against the given time-intensity products. You cannot copy the figure 1 to 50 line without analysis of a defined film. It’s like calculating how the stew should taste. Does a cook work with a calliper?
  • 0

#5 Rob Webster

Rob Webster
  • Basic Members
  • PipPip
  • 53 posts
  • 1st Assistant Camera

Posted 02 September 2010 - 01:08 PM

Sounds like a job for Stephen Levitt.
  • 0


Aerial Filmworks

Rig Wheels Passport

Glidecam

Paralinx LLC

The Slider

Willys Widgets

CineLab

Technodolly

Wooden Camera

Gamma Ray Digital Inc

FJS International, LLC

Abel Cine

CineTape

rebotnix Technologies

Broadcast Solutions Inc

Ritter Battery

Metropolis Post

Visual Products

Tai Audio

Media Blackout - Custom Cables and AKS

New Pro Video - New and Used Equipment

Ritter Battery

Glidecam

Broadcast Solutions Inc

Gamma Ray Digital Inc

New Pro Video - New and Used Equipment

Metropolis Post

Media Blackout - Custom Cables and AKS

Tai Audio

Aerial Filmworks

rebotnix Technologies

Rig Wheels Passport

The Slider

CineLab

Abel Cine

CineTape

FJS International, LLC

Wooden Camera

Technodolly

Visual Products

Willys Widgets

Paralinx LLC