As Shot isn't, due to temerpature-and-tint model

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  • Updated 2 years ago
Lightroom is unable to reproduce the in-camera color balance in raw images, due to the imposition of a temperature-and-tint model instead of R/G/B gain values.
The easiest to reproduce, and most extreme example of this, is an image captured with an IR converted camera. Quite simply, the RAW conversion engine is discarding data because it doesn't fit a blackbody/fluorescent lamp model of the world. With LED stage lighting becoming more common, the blackbody model is going to be problematic for more and more shooters.

This isn't new, I first complained about this a decade ago in ACR, but I was encouraged to raise the issue again.

Lightroom (doesn't match in-camera)



Capture One (matches in-camera)
Apologies for the compression, I was fighting the upload size limit.
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Zandr Milewski

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  • disappointed that nothing has changed.

Posted 2 years ago

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Steve Sprengel, Champion

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What Temp/Tint values does C1 show for the fully-neutralized image?  ACR is limited to 2000K for Temp.
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Zandr Milewski

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2824 / -46.7 Using those values in LR produces an even more vivid Magenta.
LR tries 2000 / -128, but even going to the limit at -150 only gets you to something sort of sepia-ish.
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Zandr Milewski

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Those C1 values are the "Shot" values, which are actually a bit cool.
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Carlos Cardona

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So is LR unusable for IR images? Is there a workaround? Victoria?
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Victoria Bampton - Lightroom Queen, Champion

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For infrared and extreme WB images, the easiest solution is a custom DNG profile tweaked for extreme WB.
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Zandr Milewski

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How would I go about building that profile? A MacBeth chart obviously isn't going to be useful here, and the DNG profile edtor seems to suffer from the same temp/tint problem (though with different units, of course).
Is 1.0.4 still the current DNG Profile editor?
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Victoria Bampton - Lightroom Queen, Champion

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Zandr, do you have any examples of "normal" (non-infrared) shots that also display a significant difference when you've shot a custom WB. 
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Zandr Milewski

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Victoria- I'm in the midst of reorganizing my library (post-Aperture), but I can dig out some stuff shot under LED stage lighting that's hard to deal with. Might take me a bit, but I'll circle back.
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John Plevritis

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When you imported the files into Lightroom what camera profile was applied?
You may have to create a new camera profile to match your custom settings.

I had a similar issue where the wrong profile was used during importing.

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DP HOME

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1) ACR/LR engines use matrix multiplication for WB inside.. K/tint is purely UI thing for dumb users

2) DNG PE manual/tutorial has instructions what to do with IR mod cameras to allow proper WB , section "Tutorial 4: Infrared-Modified Cameras and Unusual Lighting" = http://wwwimages.adobe.com/content/dam/Adobe/en/products/photoshop/pdfs/cs6/DNGProfile_EditorDocumen...
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Zandr Milewski

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AHA! That tutorial is spot on. Cranking the temp and tint over hard in the profile editor brings the sliders into a reasonable range in LR when I import these files. Still annoying that it's necessary, but it at least lets me use Adobe tools for IR work again.
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Barney Koszalka

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I too generated a new camera profile and installed it in LR.  Is there a way to apply this profle during import into LR?
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Victoria Bampton - Lightroom Queen, Champion

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Yes, you could either create a Develop preset with just the camera profile checked, and select that in the import dialog, our you can update the default settings for that camera.