Standardization of Color Temp Adjustments in Adobe CC

You should be able to see what LrC is shows to be the color temp. If this value is incorrect, then LrC is not measuring the color temp. An Adobe person may have to answer the color temp algorithm?

However, you seem to be missing the point. 

...and actually, this whole discussion can be neatly fitted into a nutshell with an example.

What is the Kelvin value of this image? What is the position of the slider on the Kelvin scale?

You seem to still make the assumption that something is actually measuring the light in the scene. That assumption is wrong, there is nothing in the camera and nothing in the software that does this.

The Kelvin adjustment in the raw processor measures only one thing: how wrong the image looks, and how much it needs to be compensated to look right. This usually - but not always! - correlates to the conditions the image was shot in.

If you have a processed RGB image there is nothing that looks wrong. It has already been corrected.

A light source can be measured, and a monitor can be measured. Therefore they will have an actual absolute Kelvin temperature. But there is no way to "measure" an image. How would you do that?

There is actually an algorithm which can calculate the differences in colors in the image. However, again we seem to be talking past each other. The bottom line is in the title "Standardization" if you call something Color Temp then this should be based on the Kelvin scale. When I buy light bulbs I buy based on the color the light emits. The unit of measure is Kelvin. In my early days of photography understanding and applying the scale to your work is important. However, today we have the flexibility to warm or cool the image in post processing. Not sure where you guys went off course. In any case I will leave it alone. 

What you are asking for is different to the discussion on how colour temperature can be used.

You want Photoshop to assign a starting point for a pre-processed RGB file on the Kelvin scale. The preprocessing could have warmed, cooled or tinted the image. So how would you measure that from just the pixel data in the image, which is all it has to go on.

Dave

What is the baseline/reference point being used in LrC for the Color Temperature? 

https://www.adobe.com/ca/creativecloud/video/discover/color-temperature.html

We just need to apply the same rules between the apps. 

@westdr1dw 

I use studio lighting for a living. That's my job, as photographer at an art museum.

I am very familiar with the Kelvin scale and what it represents. But it doesn't apply to RGB data, where any compensation for the color of the light has already been done.

Take any image you want. What's the starting point on the Kelvin scale? What Kelvin value would you assign? It doesn't make any sense.

The ACR filter uses a small subset of the full ACR raw processor, using the same controls and sliders, with the same names. But an RGB file and a raw file are two very different things.

'Apparently you do not use studio lighting'

I think you'll find that I do, and have done so since the 1980s.  If you want a Kelvin scale for RGB, perhaps you could suggest how it should be calculated on an unknown, pre-processed file with no such metadata.

Dave

Apparently you do not use studio lighting, color temp scale is measured in Kelvin. If you call it color temp, then use appropriate scale. Regardless of the file format. 

Which post are you referring to exactly? 

Where would that Color Temperature be documented in a processed file like a psd, tif, jpg etc.? 

Please post the requested screenshots. 

Apparently you do not use studio lighting, color temp scale is measured in Kelvin. If you call it color temp, then use appropriate scale. Regardless of the file format.