Limited working range of Automatic WB tool in ACR 9.3.1

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  • Updated 2 years ago
Hi. I have a problem with limited working range of Automatic WB tool in ACR 9.3.1. It cannot handle correctly too warm or too cold environment lighting.

I often shoot under energy saving bulbs which have the color temperature of 2700 K (fluorescent or LED). But the automatic white balance can NEVER pick a value less than 2850 K. So all my photos under these bulbs need a manual WB adjustment to approx 2650...2750 K. Without this adjustment the photos with Auto WB are yellowish.

The same problem rises while shooting the winter landscapes just before or after the sunset. The environment lighting in such conditions is very "cold" (up to 20 000 K), and the Auto WB tool reaches its limit (at 7500 K), making the photos bluish.

Could you please remove or alter the color temperature limits of Auto WB tool in future versions of ACR?
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Vladimir Gorbunov

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Posted 2 years ago

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Chris Castleberry, Camera Raw Engineer

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Hello Vladimir,

Just a quick question.

Are you seeing this behavior with scene-referred (RAW) images, output-referred (JPEG) images, or both?

Thanks,

- Chris
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Vladimir Gorbunov

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Hi. I am talking about RAW conversion.
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Ann Shelbourne

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You will always get less than pleasant results when shooting under the "spaghetti" ES bulbs (because there are big gaps and spikes in the spectrum which they emit).

If you are using a Nikon (and possibly some other makes as well), you can off-set this to a considerable degree by creating Custom WB settings for these odd-ball situations.

Odd-ball (non-continuous spectrum) lighting also includes fluorescent tubes, urban street and stadium lighting. Make, and save, Custom WB for all of them.
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Vladimir Gorbunov

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I know about that issue with not-continuous spectrum. But this is not the case. I get quite good results by simply changing the value of 2850 K (offered by auto WB in ACR) to 2700. And vice versa, in case of "cold" lighting.

It's obvious that Auto WB in ACR has a strict range of possible color temperatures: 2850-7500 K. And this range is not enough for all cases.
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Chris Castleberry, Camera Raw Engineer

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Thanks for following up, Vladimir.

Would you mind sharing some sample images that exhibit this behavior?

I will pass them along to the developers working directly on the WB technology to see if it would help with future improvements.

If so, please send me a link (Dropbox or similar) to the images to my email ccastleb@adobe.com.

Regards,

- Chris
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Vladimir Gorbunov

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OK, I'll do that. Thank you for your help.