Pre processing with resize makes image corrupt

[TheBrew]

Hi

I noticed yesterday that when using the pre-process on a location to resize the image to a max length of the longest side the image gets corrupted. The result file is also larger than the non pre-processed file.

Link to samples: *

I have been using the pre-process to resize to 4200px and compress to 2MB for years without issues.

Thank
/Peter

[TheBrew]

Thank you for reporting this. Looking into it!

[TheBrew]

It works fine on my side, so I'm going to need some more details in order to reproduce the issue.

Can you give me a sample file as it would be in the collection before uploading? (Preferably one you know fails)

What iOS device and version are you using?

Update: It looks like it's related to the Nikon Z9 file format. Working on it..

[TheBrew]

OK. I'm wiser.

It looks like Apple has changed the format of the JPEGs in iOS 18. Scaling the same Z9 JPEG to 4200px on iOS 17.6.1 and iOS 18.1 returns a 2.6MB and 3.0MB file respectively. The metadata is saved differently, and that's where it goes wrong.

If I can't find a proper fix today/tomorrow, I'll push an update tomorrow with a temporary workaround that I've found. (It gives me less control over how metadata is saved, but it seems to work..)

[sonander]

Super thanks Brian. Yes I am using a Z9 and iPadOS 17.6.1

I noticed it yesterday when the site where I upload live images rejected them which was really annoying as they did not come for sales.

Thanks for your always fast support

Peter

[sonander]

Hi again

I remembered one thing I have changed. Lately I have been shooting jpg instead of raw with z9. I will take some raw photos and see how it behaves.

Peter

[TheBrew]

Wow! I'm surprised you're on 17.6.1 - I'm not able to reproduce the issue using a sample Z9 JPEG on 17.6.1 (on my iPhone) but it gets corrupted by iOS 18 (on my iPad). Strange stuff.

I'm pretty sure switching to raws would "fix" it yes, because the issue is related to copying the metadata from the original JPEG to the resized one. Raws get their metadata copied a bit different, which seems to work.

[TheBrew]

That was quick. Version 7.2.2 was just approved by Apple, so I hope my fix also solves the issue you were having!

[sonander]

Thanks. I have done some testing and it looks promising.

/Peter