Call for white balance finetuning samples

Hi everyone.

Sorry to bump up this thread.

But just get my new camera and try to help opensource software, so trying to do this white balance by following White balance presets · darktable-org/darktable Wiki · GitHub and this thread.

But I’m still confuse…my camera is a Fuji, so the fine tune is like this image

So should I go from horizontal line (R: -9: B: 0 to R:9 B: 0) diagonal up (R:- 9, B :-9 to R: 9 B: 9) diagonal down (R:-9, B: 9 to R: 9 B: -9) or the whole square (200 shots…!!!)

Hi,

Unfortunately fuji does not produce usable finetuning info. Your only option is to just create presets without finetuning. If you did finetuning here’s the message you’d receive from extract_wb tool:

Warning: Fuji does not seem to produce any sensible data for finetuning! If all finetuned values are identical, use one with no finetuning (0)

This is explained in White balance presets · darktable-org/darktable Wiki · GitHub article, but thanks to various manufacturers variably vary interface it’s not as straightforward as it should be…

So in case of fuji, if they ever decide to actually put finetuning info in exif data, the correct axis is: vertical horizontally centered.

As you can see o top in vertical it’s blue and bottom on vertical is warm-ish yellow-orange. That’s amber-blue axis.

Horizontal line is from green to weirdo pink in your example and it’s the one we don’t want (magenta-green)

Well…it doesn´t I try with a bunch of files (event with the wrong selection of finetune, I was doing horizontal change) it produce a tar.gz with files .txt.

Are you sure ? Because the problem (maybe it’s because my english suck) but if I go vertically, center horizontally I will go from (R:0 : B: -9 to R:0 B:9) and for me R stand for «red» (close to Amber) and B stand for «blue».

So can you just confirm it’s really what you need (R:0 B:-9 to R:0 B:9) without any change on R.

The tool producing .tar.gz files is extract_wb_from_images.sh, this just extracts exif data to txt files so you can send it as a package to darktable devs who’ll ran extract_wb.py on them… It’s as simple as possible and makes no detection of fuji fun times. It’s extract_wb.py that does the heavy lifting and complaining about fuji not having normal data :slight_smile:

Yeah, I’m pretty sure. I wrote the thing :stuck_out_tongue:
And I can bet that there won’t be proper finetuning data in exif output from fuji files, but I’d be happy to be mistaken :slight_smile:

Hi @johnny-bit .

So you’re right, fuji doesn’t change anything. I just try both fine tune and lazy. And yes in the fine tune no data.

I will try the lazy mode

Z

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Hi all.
I’m looking forward to create samples for camera support, white balance and noise reduction for Panasonic Lumix DC-TZ99.

I would like to know if:

are white balance samples still useful? This post made me raise some doubts.

for which camera white balance modes should I take samples? TZ99 has the following modes:

  • AWB
  • AWBc
  • AWBw
  • daylight
  • cloudy
  • shadow
  • tungsten
  • flash
  • custom (with manual white point measure)
  • temperature (I can set any color temperature from 2500K to 10000K, by 100K intervals).

I figured out that I should not take samples of AWB and custom, and take samples of daylight, cloudy, shadow, tungsten and flash, but what about AWBc, AWBw? Should I take samples of specific temperatures? And in that case, what temperatures?

Thank you in advance

I’d start w/ the raw samples and base support first. As w/ many Panasonics, this could turn out to be an “alias” of another camera that might already be supported and perhaps also have a noise profile (e.g. this seems to be refresh of the old TZ95/TZ95D/TZ96/ZS80)… It’s a bit more complicated for WB presets when it comes to Panasonics, as they release the same basic camera under many aliases and change WB (and other JPEG rendering defaults) depending on region (US vs EMEA vs Asia)… There’s no alias handling for WB presets in darktable yet, so we don’t tend to merge those if they differ between regions, and in this case we’d like to check those against ZS99 (and other potential aliases).

Thank you! I’ll go with a base RAW sample for now.