LUT export/import do not work properly

[Mariusz_F]

macOS Ventura v.13.2
Hardware acceleration ON
Problem description:

After exporting LUT and then importing it back o the image, the image outlook is not the same, eg. very low contrast.

Size of the LUT do not influence the result.

The same problem appear in Affinity Photo V1.

[walt.farrell]

15 minutes ago, Mariusz_F said:

After exporting LUT and then importing it back o the image

Can you explain your workflow a but more, please?

How did you get a LUT to export?

If it was already in the image, then wouldn't adding it a second time have to change the results?

[Mariusz_F]

Workflow is typical I think:

1. I make adjustment to the image eg. white balance, curves, etc.

2. I export the LUT

3. I open the same original image, with no adjustments

4. I import LUT what was exported in step 2.

And the final result is like on the images attached, that the new image has a different look, no contrast, etc.

 

[walt.farrell]

Thanks. The two images you've included look almost identical to me. Perhaps you could provide the original .afphoto file including the adjustment layers, the .cube file you exported (and a screenshot of that export dialog), and the new .afphoto with the LUT applied?

[Dan C]

Hi @Mariusz_F,

Thanks for your report!

I can confirm this issue is logged with our developers as a bug, I will be sure to 'bump' this with our team now to bring it to their attention once again.

I hope this helps

[Dan C]

Hi @RalphMara,

Welcome to the Affinity Forums

Unfortunately this issue is still logged with our development team to be resolved at this time - I will be sure to 'bump' this with your post for you now.

I hope this clears things up!

[Thomasdelange]

Hi @Dan CI have the same issue, which is unfortunate since I was planning on using these LUTs for batch processing my vacation images. It seems that exporting Luts works better when the adjustments are not embedded in a group in the layers panel.

 

Edited March 12, 2023 by Thomasdelange

[Dan C]

Thanks for letting me know @Thomasdelange and I'm certainly sorry to hear this - I will be sure to 'bump' this with our team to bring it to their attention once more, and include the information above.

I hope this helps!

[Affinity Info Bot]

The issue "LUT does not apply the same effect after it has been exported" (REF: AFP-4767) has been fixed by the developers in build "2.1.0.1806".

This fix is in the current customer release.
If you still experience this problem once you are using that build version (or later) please reply to this thread including @Serif Info Bot to notify us

[Maxdanger]

@Serif Info Bot I've encountered this bug when editing in a 32 bit workflow. Confirm it has been fixed for 16 bit but it still exists for 32 bit. Here's a video I recorded

 

 

Using latest version Affinity Photo v2.1.1.1847

[Dan C]

Many thanks for updating us here @Maxdanger, I can confirm that I'm seeing the same behaviour and I have therefore reopened the issue with the development team.

I hope this helps  

[Maxdanger]

2 minutes ago, Dan C said:

Many thanks for updating us here @Maxdanger, I can confirm that I'm seeing the same behaviour and I have therefore reopened the issue with the development team.

I hope this helps  

Awesome - cheers for the quick reply around Dan  

[lucy dawlish]

Spent a while colour grading and saved the grade as a lut, but all the lut did when I imported it back in was increase the luminosity and saturate the reds, it subtle. As you can see from the 3 images the grade is not subtle at all lol.

Before grading

After grading not subtle at all with the Teal and orange / pink with just the adjustment layers turned on.

This is with the adjustment layers turned off and just the Lut turned on.

So just to make sure it was not me I opened up another photo with plenty of blue similar sky [actually photo taken on the same day] and red to check the LUT obviously the blee should have gone teal in colour and the orange-reds more pink. but as you can see it has just not done the job at all.. 

Before applying the Lut

After applying the LUT, reds and oranges have become a little more saturated, and obviusly the sky and water have not turned teal in colour. 

I am using the Mac M1 Sonama 14.3.1 affinity photo2 build 2.4.1

Edited April 2, 2024 by lucy dawlish
added a photo

[Dan C]

Welcome to the Forums @lucy dawlish!

Sorry to see you're having trouble - as above our team are aware of issues with exported LUTs retaining the same colour adjustments, as present in the file before exporting.

This is logged with our development team and I'll be sure to 'bump' this with them now, including the information provided in your screenshots above.

I hope this helps

[lucy dawlish]

@Dan C thanks for your reply, I could see that the issue was there in June 2023 but as it was April 2024 thought it OK to just bump this to the team. Asd I could not see anywhere the the issue had been resolved or not.

 

Anyways thank you again for your quick reply
I hope there is a resolution to this issue soon as it would help with workflow immensely for me.

Kind regards

LucyD

[AP-]

This bug is still present in 2.5.5 on Sequoia 15.0.1.

How to reproduce:

1. Open 8-bit JPEG (or develop a 16-bit image from RAW).

2. HSL adjustment layer, curve adjustment layer and selective colour adjustment layer.

3. Export LUT.

4. Import the saved LUT and click the panel button or create a LUT layer and load the file.

 

It does not apply.

 

An interesting behaviour noted:

It works fine if you add a white balance adjustment. The fix for me is to add a 1% white balance adjustment with 1% change in both sliders.

 

Another interesting fact:

Delete all the adjustment layers. Repeat steps 1-4 above. The exported LUT is the last one saved with a white balance adjustment layer rather than the current one you try to save.

[walt.farrell]

8 minutes ago, AP- said:

This bug is still present in 2.5.5 on Sequoia 15.0.1.

The issue is still open (unfixed), which we can tell because the Affinity Info Bot has not posted to say that it has been fixed.

Your other points are interesting; thanks for noticing and mentioning them. That may provide additional info for the Serif team to help resolve this.

[AP-]

Yieesss.

I do have a question though. Does the Export LUT only export the bare adjustment translations or does it include say, a live mask applied to the adjustment layer? I'm thinking a use case here of targeting specific luminosity ranges with the luminosity mask.

[walt.farrell]

3 hours ago, AP- said:

Does the Export LUT only export the bare adjustment translations or does it include say, a live mask applied to the adjustment layer? I'm thinking a use case here of targeting specific luminosity ranges with the luminosity mask.

I can't think of any way that a LUT could incorporate a mask. It's just a table of input vs output numbers for colors, as I understand them.

[AP-]

That's what I initially thought, but upon consideration, the luminosity mask is just another way to manipulate the same data, hence the question. It's a bit like which part of the curve one would be editing, so should in theory be possible to map. Also, the fact that the .look extension specifies LUT only implies the other two formats are able to export other things. I was sort of thinking, what, though?

[X-Raym]

Hi, Affinity 2.6.0, Win 10x64

I still confirm that exported conversion table (LUT, Cube etc), aren't reimported back properly.

Here is Demo with .cube export

https://cloud.extremraym.com/sharex/Photo_o6rIHrbyV8.mp4

Same problem with .look export (in this case, it just do nothing)

I would love to see this fixed. I need to apply the same profile on 35 document (some kind of color correction for scanners) and having the correction stored as external file (a LUT for eg) is the only way to have the correction dynamically applied over all the document (handy if it need to be adjusted).

Can you take a look ?

@AP-

I also noticed luminosity max produced black and white output in the Export table preview window.