Re: Colorimetric Accuracy in the Field
Re: Colorimetric Accuracy in the Field
- Subject: Re: Colorimetric Accuracy in the Field
- From: Iliah Borg <email@hidden>
- Date: Tue, 04 Jun 2013 13:18:48 -0400
> 3. Use dcpTool. (http://dcptool.sourceforge.net/Introduction.html) This command-line driven software can decompile binary format DNG profiles into XMP, compile XMP files into new compiled DNG profiles, make a profile "invariate" (an invariate profile won’t cause changes in tint when you make adjustments to exposure settings), and untwist a profile. (An invariate profile won’t change color when you adjust exposure settings, but still has hue twists embedded within it. Untwisting a profile removes all hue twists completely. See http://dcptool.sourceforge.net/Hue Twists.html)
With dcpTool you can reduce the "DNG profile" (DNG Camera Profile, DCP) to a simple matrix (ColorMatrix), however in ACR/LR white balance is still applied using ColorMatrix interpolation or extrapolation. Unless ad hock dcp is calculated for the light in the scene the result of interpolation/extrapolation is unpredictable in terms of colour.
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Best regards,
Iliah Borg
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