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Re: camera colour space (do the raw converters 'know' them)
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Re: camera colour space (do the raw converters 'know' them)


  • Subject: Re: camera colour space (do the raw converters 'know' them)
  • From: Nov06 <email@hidden>
  • Date: Sat, 8 Mar 2008 19:13:48 +0100

On 8 Mar 2008, at 16:20, info wrote:
Nov06 wrote:
A camera does the same as a raw converter. It converts the raw data
into RGB data existing in an internal colour space.

Don't most raw converters use generic input profiles as a starting point , unless ( like Capture One or Bibble) they allow for complete manual control of the conversion inorder to produce an untagged Tiff file for profiling?

I would have hoped that ACR, Aperture, and Nikon Capture NX do use custom profiles for each camera, otherwise what would the 'ColorMatrix', 'CameraCalibration', and 'AnalogBalance' tags in the DNG specification be good for, and why would it take the applications so long to support a new camera. But I have not seen any fully conclusive evidence either way so far.



Somehow this "output referred rendering" seems to know source colorimetric values and is able to place them (or prepare them for placement) into specific target values. The only way that I am aware of, for a camera manufacturer to know what specific colorimetric values any camera produces would be to measure them with a spectrophotometer.

One would hope that's what they do, even though an accurate representation is not always the same as pleasing skin colours (and that might be what the camera manufacturers and raw converter software developers are shooting for in part). The other problem is that even with accurate camera profiles, a camera or raw converter still has to guess/estimate the white balance, where all accuracy breaks down usually without very well defined studio conditions (and the possibility to communicate to the camera/raw converter these precise conditions).



Is it possible that this "output referred rendering" is actually either several alternative input profiles or a single input profile with different "rendering " instructions for the CMM.

I think these two things are mathematically equivalent or can be made mathematically equivalent.
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 >Re: Colorsync-users Digest, Vol 5, Issue 82 (From: "info" <email@hidden>)

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