Problem with white balance

[Kutsche66]

Hi,
I have a problem with the white balance.

When I do the white balance with the pipette in the RAW converter, I get a different result than when I do the same in the developed but unedited image. In both cases, I chose exactly the same pixel. The result deviates considerably.

Why is the result different?

LG Kutsche

[Old Bruce]

I think that it is the result of using two separate algorithms. I do not know this, I only suspect it.

[Lee D]

Hi @Kutsche66  When you refer to the RAW converter, I assume you mean the Develop persona? It may relate to colour modes, after importing your RAW file check the context toolbar  above the image to see whats it's currently displaying in. Take a screenshot using the colour picker so we can see the values and the info on the context toolbar. Then click the Develop button and do the same and then upload the screenshots so they can be checked.

[Kutsche66]

Hey Lee D,

Yes, I mean the persona.
Attach the two pictures. What I can see is that the RGB value has changed.
Screenshot 1 is from the RAW, screenshot 2 from the developed image.

LG Kutsche

[Gnobelix]

Hello @Kutsche66,

it's just a guess, the develop persona is in 32 bit HDR color space  and photo persona is in 16 bit color space.
Change the color space so that the input image and output image use the same color space.
Then try white balance again.

 

Cheers

[Kutsche66]

Hello Gnobelix,

Thanks for the answer. And how can I adjust that the photo persona also has 32 bit HD R? I could not find this attitude.

LG

[Gnobelix]

Hello @Kutsche66,

The output of the color space is set in Development Assistant.

Cheesrs

[Kutsche66]

Hi Gnobelix,

Thank you for your answer. Unfortunately, I still have a different result.
Screenshot1 and Screenshot2 show the same picture. 1 is developed, 2 as RAW. Both completely unprocessed. Here, however, the lens correction is still active in the settings. Looks like you too.

On the second try, I disabled this preference. The same picture. 1 again, 2 as RAW. 1a and 1b are without white balance. Here both pictures look the same. At 1b and 2b I did the white balance on the same pixel in the lower left corner. Here the result differs considerably again. Why?

greeting

[Gnobelix]

Hello @Kutsche66,

I have no explanation for that.
Could you please provide an original RAW file?
Maybe it's the underwater image have this problem, or are there similar problems with other image?

 

Cheers

[Kutsche66]

Hi Gnobelix,
the white balance I do only with underwater pictures. I have attached the original from my example.

LG Kutsche

_A160096.zip

[Gnobelix]

Hello @Kutsche66,

Thanks for the RAW-File.

I think @Old Bruce is right about the hunch that two different algorithms are used.

In that case, only Serif can answer the question, why two different algorithms are used.

 

Cheers

[Kutsche66]

Hi Gnobelix,

Can you tell me how to contact Serif support?

LG Kutsche

[walt.farrell]

9 minutes ago, Kutsche66 said:

Can you tell me how to contact Serif support?

One of the Serif staff ( @Lee D ) is already aware of this conversation, and is Following the topic. So you've already contacted them.

[James Ritson]

Hi @Kutsche66, the difference you're seeing is expected regardless of whether you're in 16-bit or 32-bit, here's a quick explanation:

When developing a RAW file, Photo knows the initial white balance (white point) and is able to change this which in turn offsets all the relative colour values.

When entering the Develop Persona from a pixel layer or using the White Balance adjustment layer, the initial white balance is no longer known, plus the image has already been mapped to a colour space and relative white point. Therefore, rather than presenting a Kelvin scale, you instead have percentages—here, the adjustment is simply performing an offset based on an arbitrary white point, and so the result will look different (this includes the usage of the colour picker).

That said, the scaling of the percentage version is not set in stone: it could be modified to more closely match the scale of the Kelvin version. It would however have an implication on existing documents that use the White Balance adjustment layer, so would require care if it was to be modified.

There's an additional complexity with your image in that it requires a very dramatic white balance shift, e.g. if you use the white balance picker on the white coral the Kelvin value shifts to around 9000K. The adjustment version with its percentage slider can't go this far, so you won't be able to get the two to match.

Hope that answers your question! I'll investigate the white balance scaling and see if it's possible to make some improvements here.