P: SDK: photo:getDevelopSettings() sometimes returns nil for Temperature and Tint

[johnrellis]

photo:getDevelopSettings() sometimes returns nil for Temperature and Tint.   Tested in LR 12.2 and 10.4 on Mac OS 12.6.1.

To reproduce:

1. Download and unzip this catalog folder ("Temperature"):

https://www.dropbox.com/s/z527z9to4ie46vx/Temperature.2023.03.02.zip?dl=0

2. Copy the file "get-temperature.lua" from the catalog folder to the User Scripts folder.

3. Open the Temperature catalog.

4. Select the one photo and go to Develop.

5. Go to Library and do Scripts > get-temperature. Observe the temperature and tint are correctly displayed:

6. Do Quick Develop > Reset All.

7. Do Scripts > get-temperature and observe that temperature and tint are incorrectly nil:

[C.Cella]

@johnrellis 

Apologies John.

I have now check the DNGs effected in my test catalog and they all originate form a JPEG or a non RAW file which explains the lack of Temperature and Tint.

So no actual RAW file is affected.

.

[johnrellis]

This is all fairly new to me too. I hadn't really looked into DNGs much until Denoise and the recent use of JPEG XL compression instead of JPEG.

[Rikk Flohr: Photography]

Marking fixed as requested in the thread. 

[johnrellis]

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This misbehavior has reappeared and can be reproduced again in LR 13.5.1 / Mac OS 14.6.1 -- photo:getDevelopSettings() sometimes returns nil for Temperature and Tint.

1. Download and unzip this small catalog:

https://www.dropbox.com/scl/fi/nmh89jdu83e34vyhdgcj9/Temperature.2024.09.20.zip?rlkey=iib53zohs7ugef... 

2. Copy the file "get-temperature.lua" from the catalog folder to the User Scripts folder.

3. Open the catalog.

4. In the Folders panel, right click the folder Temperature and do Synchronize Folder and import the one photo.

5. Select the one photo and do Scripts > get-temperature and observe the correct output:

6. Do Quick Develop > Reset All.

7. Do Scripts > get-temperature and observe the incorrect output:

8. In Quick Develop, click Exposure > Increase Exposure 1/3 Stop.

9. Do Scripts > get-temperature and observe the correct output:

* * *

I've successfully tested this workaround on about 500 photos that were originally reporting nil:

    if nil == photo:getDevelopSettings ().Temperature then
        photo:quickDevelopAdjustWhiteBalance ("Temperature", 0)
        end
    assert (nil ~= photo:getDevelopSettings ().Temperature)

[johnrellis]

@Rikk Flohr: Photography, this bug was originally reported with LR 12.2 and 10.4, but I could no longer reproduce it in LR 13.0.1, so I asked that the issue be closed. It can now be reliably reproduced in LR 13.5.1, as I determined responding to the developer of the Power Keys plugin.  Should this be posted as a new report or would you prefer it left here?

[David Wavid]

Seeing your post @johnrellis, I ran tests in my code and can confirm I'm also seeing this issue in Lightroom Classic 13.5.1.

[Rikk Flohr: Photography]

I am checking with the team to see if they want to reopen the bug fixed in 13.1 or have a new bug. 

[Rikk Flohr: Photography]

@johnrellis 

Let's do a fresh report for this one. I will watch for it.