Re: RPP raw photo processor 64
Re: RPP raw photo processor 64
- Subject: Re: RPP raw photo processor 64
- From: Lars Borg <email@hidden>
- Date: Wed, 05 Jun 2013 16:37:27 -1000
At 1:22 PM -0700 6/5/13, Ben Goren wrote:
Cameras are (essentially) linear devices.
Depends on what you mean by essential.
For the cameras I've calibrated the raw values for the CC24 gray
steps don't track, even after adjusting for flare etc.
This hints at the camera not being linear.
Everything else, especially ACR, instead invisibly translates
blackbody radiation sliders into those channel multipliers using
some secret sauce recipe.
The recipe is plainly readable in the code of the DNG SDK and follows
the DNG specification and a well-known matching procedure as
documented in the code. Both are public, hardly a secret.
As shown in the code ACR doesn't assume black body radiator for D65.
> [T]he camera imposes an inherent error. The colorimetric problem
starts there, in the camera. I don't know if a sensor or
combination of filters can be made that would make a colorimetric
match possible.
Agreed. Every camera is a compromise.
Lars
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