Exported files tagged incorrectly / missing tags

I’m trying to create file that uses SGamut3.Cine+SLog3 yet when I export it it is not tagged as such / correct tag is missing even though I specifically said to export to use SGamut3.Cine+SLog3 tags. In turn anything that tries to work with that file thinks it is Rec709.

My color space settings are in first screenshot below and export in second and third one.

What is going on, please? If that is relevant I am on 18.1.4.

Wrong Tag Color Space.JPG (76.5 KiB) Viewed 1019 times

Wrong Tag Color Export 1.JPG (66.76 KiB) Viewed 1019 times

Wrong Tag Color Export 2.JPG (55.87 KiB) Viewed 1019 times

Interested, but no solution. Presumably if you bring that back into Resolve under RCM and set the input gamma and gamut appropriately, the image looks correct?

Presumably if you bring that back into Resolve under RCM and set the input gamma and gamut appropriately, the image looks correct?

No, it does not, which is a separate topic for separate thread I'm still working on documenting before posting.

What does look correct? Rec709 gamma 2.4?

What does look correct? Rec709 gamma 2.4?

Here is my write up on why I feel Resolve's handling of SLog3 and SLog2 files might be incorrect:

viewtopic.php?f=21&t=183484

As Andrew Kolakowski wrote in your other thread, there are no tags for Slog in MP4 or MOV.
That's not BM's fault.

Since Sony's Catalyst Browse is for free and can read such information, it might help to do some experimentation and conversion there. If you do, please report.

As Andrew Kolakowski wrote in your other thread, there are no tags for Slog in MP4 or MOV. That's not BM's fault.

Thank you and Andrew for pointing that out. I was having an impression there might be such tags because there is nothing in Resolve that prevents me from saying "use those tags". Resolve doesn't pop up an error message "I can't tag file as SGamut3.Cine + SLog3 on export, it's impossible cause there is no such tag", it happily accepts it without a word of warning.

The price of freedom, you can make as many mistakes as you like

Seriously, one can't use digital video without a decent amount of knowledge of formats, codecs, and standards. Since Slog, V-log, C-log, whatever-log are not standardised at all, they belong into cameras, not into exported files. Where is the device for audiences supporting them? And every new camera manufacturer likes to make their own, while the established ones make version 1,2, and 3, yadda, yadda.
If DR would try to analyse and label of all these correctly without receiving tags, the developers would be busy all day long inventing a new AI instead of fixing bugs

We have a few standards for export and should adhere to them, like SDR or HDR TV and cinema. Regarding freedom, you can export whatever you like, as long as you or your team know what to do with that file.

I'm curious. What is the use case for exporting S-Log?

The price of freedom, you can make as many mistakes as you like
...
If DR would try to analyse and label of all these correctly without receiving tags, the developers would be busy all day long inventing a new AI instead of fixing bugs

... or the price of what I call extremely poor user interface design.

I'm not expecting BMD, or any other software developer, to sort out what is 3rd party's mess but I do expect all of them not to happily, without any warning, accept input value they know is incorrect and will be ignored.

Year is 2023, times when typical software developer would write code that accepts anything as input, wasn't checking whether value is valid and warning / refusing to proceed if it wasn't, are long long gone, such developer wouldn't be passing the hiring process / performance review nowadays.

I'm curious. What is the use case for exporting S-Log?

In this case it was to generate file with synthetic chart that could be used for testing of how SLog3 files are handled when imported and processed.

OK.

It begs the question, though...why?

It begs the question, though...why?

Because I need to test handling of SLog3 files (please see thread I referenced above) and using synthetic test charts is quickest and most precise way to go about it. I guess same reason(s) people use gray scale synthetic test charts in general.