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#1 Sebastien Testeau

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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!
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#2 John Holland

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Posted 05 August 2010 - 11:35 AM

Err good luck with that what ever you are trying to do !
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#3 Robert Houllahan

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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-
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#4 Simon Wyss

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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?
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#5 Rob Webster

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Posted 02 September 2010 - 01:08 PM

Sounds like a job for Stephen Levitt.
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