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Archive 2022 · Skin tones with A7rV

  
 
Jesse Evans
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p.2 #1 · Skin tones with A7rV


All skin tone issues in raw files out of camera can be resolved through white balance offsets in every camera on the market.


Dec 03, 2022 at 04:30 PM
indusphoto
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p.2 #2 · Skin tones with A7rV


BlueBomberTurbo wrote:
You don't even need to change your RAW processor. Just get better profiles. DXO can use the same exact profiles Adobe uses, since they both use DCP format profiles. C1 uses ICC, so it's a bit tougher to find equally as good profiles, as C1 doesn't allow dual illuminant profile creation.


A better raw processor also gives other benefits, for example more details, better noise reduction, and (in some cases) better dynamic range.



Dec 03, 2022 at 07:49 PM
Ayoul
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p.2 #3 · Skin tones with A7rV


The color profile is responsible for 90% of the final result, the 10 % remaining are because of the the camera. This simple statement is from Anders Torger, the founder of Lumariver, who probably knows his subject more than everyone here. I've quoted him numerous times on this subject and I will probably continue to do it...

Why the 10% due to the camera ? Yes, there is no color information in a raw file. But in the end, all the filters from the CFA of the camera filter the light by wavelength range. The red filter on on your camera A doesn't filter exactly the same light as the red filter on your camera B, same for the green and blue.

He explains it better than I would do (because he knows better): https://www.lumariver.com/lrpd-manual/#c1_workflows
Look for the "subjective color" section.

Long story short, there are less differences today between cameras than before. But there are of course a lot of differences in their jpeg rendering, due to a lot of parameters than you can change in the profile (one of the most spectaculary is indeed the Tone Reproduction Operator)

So the influence of the camera is not equal to zero, but it's not enormous either. I've calibrated Sony, Nikon and Fuji cameras using Lumariver (and before that using more rudimentary softwares) and could make them reach the same rendering minus a very few differences.

When people argue about the rendering of the camera X vs camera Y, sometimes they don't even take the time to specify which profiles in which software they use. But it doesn't seem to prevent them to make very specific and exotic statements about the green of camera A, the skin rendering of camera B, etc, etc, with a lot of confidence.

What is the comparison ?

jpeg rendering of camera A vs B ?
Adobe standard camera A vs B ?
The sometimes very approximate mimic of the manufacturer rendering in LR from camera A and B ?
The generic or prostandard rendering in C1 between camera A and B ?

Sometimes, we can read an argument of 15 messages without even knowing this...

And of course, besides the camera profile, there is the huge influence from the white balance and the exposure on our perception of colors.



Dec 05, 2022 at 09:15 AM
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