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Photoshop Setting Color Temp

Enthusiast ,
Dec 25, 2024 Dec 25, 2024

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Not sure if this needs updating in the documentation on Adobe website; Changing Color Temp 

Normally I set the color temp in LrC. However, I was working in PS and instead of kicking it over to LrC I looked for a way to adjust the color temp in PS. Went to the link above to see HT. Is there a panel in PS "Look"? 

 

May be add a slider to one of the Adjustment Layers to set color temperature

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Community Expert ,
Dec 25, 2024 Dec 25, 2024

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If you're working with raw files, they will open in the Camera Raw plugin, which has exactly the same editing tools as LrC.

If you're opening rendered (non-raw) files in Photoshop, use the Camera Raw filter, (found in the Filter menu) to adjust color temperature. For a non-destructive workflow, create a copy of the background layer, right click the layer and choose Convert to smart object.

Then run the filter on the layer, and you can go back to the filter anytime and change the settings like in LrC.

Double-click Camera Raw Filter in the Layers panel to re-open the Camera Raw filter.

 

The documentation you linked to is for Speedgrade, which is for video color grading.

 

image.pngexpand image

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Enthusiast ,
Dec 26, 2024 Dec 26, 2024

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Thanks, seems like a lot of work to adj color temp. However, instead of floating between apps, consideration for a simple slider in PS. OTH is the juice worth the squeeze as most change color temp in either ACR or Lr* prior to moving to PS.

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Community Expert ,
Dec 26, 2024 Dec 26, 2024

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Well, as Per explains, there already is - the ACR filter.

 

In any case, this is all rather arbitrary, even for raw files. There is nothing that "knows" the color of the light in the original scene. Any adjustment is just compensation, whether by automatic algorithms or by eye. The latter is always more accurate than the former.

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Enthusiast ,
Dec 26, 2024 Dec 26, 2024

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Yeah, not sure why anyone would think an autonomous color temp would be a good idea. 

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Community Expert ,
Dec 26, 2024 Dec 26, 2024

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@westdr1dw 

 

It needs to be understood that adjusting white balance on raw sensor data is totally different to doing so on rendered data. One does not get equivalent results, even when using the Camera Raw filter on a rendered image compared to using the Adobe Camera Raw plugin on raw data (or even when using the Adobe Camera Raw plugin for both raw and rendered data).

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Enthusiast ,
Dec 26, 2024 Dec 26, 2024

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@Stephen Marsh

Just out of curiosity since LrC can pass a RAW image to PS, and PS can pass RAW images to LrC what is the difference? Does anything change in the transfer process? 

Is the change perceptible in the IQ?

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Community Expert ,
Dec 26, 2024 Dec 26, 2024

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quote

Just out of curiosity since LrC can pass a RAW image to PS, and PS can pass RAW images to LrC what is the difference? Does anything change in the transfer process? 

Is the change perceptible in the IQ?


By westdr1dw

 

I don't use LrC, both LrC and the Adobe Camera Raw plugin use the same processing, so as long as the data is raw sensor data, then the results should be the same.

 

Processing linear, single-channel raw mosaic camera sensor data differs greatly from processing rendered data. White balance should be performed before rendering to gamma-encoded RGB data. If you wish to perform WB outside of raw development, you can’t expect the same results.

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Community Expert ,
Dec 26, 2024 Dec 26, 2024

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The top image had the custom WB set on the raw file in the Adobe Camera Raw plugin. The bottom image was set to "As Shot" and saved as a TIFF, then opened in the Adobe Camera Raw plugin and the custom WB was set on the same patch as the raw file.

 

top-raw-wb_bottom-tiff-wb.jpgexpand image

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Enthusiast ,
Dec 26, 2024 Dec 26, 2024

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Not sure we are comparing apples to apples in the image provided?

The image was saved as a TIFF file, which has a lower color gamut than RAW?

If you are passing a RAW image from LrC to PS why would it matter?

Isn't a RAW, file a RAW file whether in LrC or PS?

Just trying to get a better understanding of an image in RAW, regardless of which Adobe app is used. Not to digress, I know there was a difference in the Graphics engine between MS Office apps, even though MS claimed it was using the same Graph engine between the Office apps. 

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Community Expert ,
Dec 26, 2024 Dec 26, 2024

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quote

Not sure we are comparing apples to apples in the image provided?

The image was saved as a TIFF file, which has a lower color gamut than RAW?

If you are passing a RAW image from LrC to PS why would it matter?

Isn't a RAW, file a RAW file whether in LrC or PS?

Just trying to get a better understanding of an image in RAW, regardless of which Adobe app is used. Not to digress, I know there was a difference in the Graphics engine between MS Office apps, even though MS claimed it was using the same Graph engine between the Office apps.


By westdr1dw

 

That has been my point!

 

The Adobe Camera Raw plugin ideally works on raw camera data, and is external/separate to Photoshop.

 

Photoshop and the Camera Raw filter works on rendered data, on images open in Photoshop.

 

I have already commented twice that rendered data isn't the same thing as raw data... You can't have a "white balance adjustment layer slider" as per your idea/feature request and expect it to work the same as the Adobe Camera Raw plugin for raw data. It would work just like the Camera Raw filter or Adobe Camera Raw plugin for rendered data, as once a file is open in Photoshop it is rendered/processed and no longer raw sensor data.

 

Photohsop and Bridge already have an external tool for working with white balance on raw camera sensor data – it's the Adobe Camera Raw plugin.

 

Yes, a raw camera file is a raw camera file in both apps, the same processing engine is used in both LrC and the Adobe Camera Raw plugin.

 

I don't use LrC so I don't know if raw or rendered data is being passed back and forth. I only know of the "open in Photoshop" command which sends processed, rendered data, not raw.

 

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Community Expert ,
Dec 26, 2024 Dec 26, 2024

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Just trying to get a better understanding of an image in RAW, regardless of which Adobe app is used.


By westdr1dw

 

I invite you to read over and absorb these PDF files on raw sensor data processing:

 

https://www.dropbox.com/scl/fo/iw6u5b3m4am8r9nnodu7w/AFmuMFntWN6R50TtH1Hubwk?rlkey=i2n6khg0b9dk73exe...

 

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Community Expert ,
Dec 27, 2024 Dec 27, 2024

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@westdr1dw 

Yes, Stephen has explaned this in detail.

 

If I can try to sum it up, it would be that as much global adjustment as possible should be performed at the raw stage in ACR/Lightroom (which are identical).

 

The reason is that a raw file contains much more information than can be held in a rendered and gamma encoded RGB. Processing a raw file discards a lot of data that you can't get back. The processing decides which parts to keep and which to throw out.

 

Ideally, you move to Photoshop when all global processing, or as much of it as practically possible, has been exhausted in ACR/Lightroom. Then you can do smaller/local adjustments and masking in Photoshop, where it's still easier to control.

 

I assumed that you had no choice and had to do white balance in Photoshop. But if possible, do it in ACR.

 

@Stephen Marsh  One of Lightroom's inherent weaknesses is that it presents raw and RGB files the same way to the user. That's no problem as long as you keep them separate, but beginners can easily be led to work on RGB files when they should be working on the raw files.

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Enthusiast ,
Dec 27, 2024 Dec 27, 2024

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Hey Steve;

 

Appreciate the information. Has been more than a few years since I have read the Schewe/Fraser book. I have one of his books "Digitial Print". Always good to get back to a refresh of the basics. I am familiar with the a lot of the information covered in the book. 

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