Why is auto white-balance capped at 7500K?

Forum|Forum|7 years ago
December 23, 2018
2 respuestas
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Just this...I'd like to know why AWB is capped at 7500K. There are many instances when the white balance should be measuring much higher...

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Todd Shaner

Legend

Auto WB is the average of the WB readings for the entire image. There may be some other intelligence applied, but it's pretty much just calculating the average WB reading of the summed pixel image data. Images that have a predominance of a specific color such as blue will have the WB settings skewed toward that scene referred color. To provide a better Auto WB results Adobe is apparently limiting the maximum Temp value to 7500. The same happens when using in-camera auto WB setting.

JBedfordPhotoAutor

Inspiring

Thanks for your reply, Todd. I suppose you're correct in hypothesizing that the limitation is to achieve a more accurate WB. There's a chance I'm mistaken, but I think my Fujifilm RAWs AWB sometimes gets higher than 7500K SOOC. Maybe Adobe will push the boundaries of AWB in near-future updates to ACR. Here's hoping (not that it's a big deal or anything, I was simply curious).

Todd Shaner

Legend

I was going to suggest you post this as an 'Idea' in the Photoshop Family forum, but see you did that two years ago:

Lightroom/Camera Raw: Beyond 7500K: Why doesn't auto-white balance go further? | Photoshop Family Customer Community

I suggest reviving that post (or create a new one) and add screenshots of sample images that need more than 7500K Temp. Show the results for LR's Auto WB and your manual adjustment of WB using LR's Compare mode. Pictures with extreme white balance (Sunset, Cloudy) typically look better when they are NOT fully white balance corrected. That said if you can provide examples where more than 7500K Auto WB limit improves the image it will go along way for making your case.

GoldingD

Legend

Went and tested this out. From that I need to ask.

Are you editing a exported TIFF, or perhaps a exported JPEG? or JPEG SOC?

For Raw this should not be the case. For RAW in the form of DNG (as created at import) this should not be the case.

And what camera?

JBedfordPhotoAutor

Inspiring

Thanks for your reply, David. I'm shooting RAW frames both in Canon and Fujifilm.

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