[Bug report] Saving a raw image may result in a different checksum compared to the original raw image

[dvbthien]

Version

3.5.0

Platforms

iOS

Device Model

iPhone XS (IOS 15)

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How to reproduce?

Hi @AlexV525,

The Immich mobile uses this package to save remote images to the gallery on iOS. However, when I downloaded a remote image on iOS 15.1, the locally downloaded image had a different checksum than the remote image. As a result, Immich on mobile displayed two images: one local image and one remote image. It only happens with images.

After investigating the problem, it seems that photo_manager uses PHAssetCreationRequest in saveImageWithPath to create a new Photos asset, which sometimes changes the info metadata and results in a file with a different hash. Can you add creationRequestForAssetFromImageAtFileURL and creationRequestForAssetFromVideoAtFileURL to add raw assets to the gallery without changing the checksum?

I really appreciate you taking the time to read this.

Logs

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Example code (optional)

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Contact

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[AlexV525]

Happy to, but we should figure out if there is a side effect for the saving method.

[dvbthien]

I've already tried and haven't found any major issues. The assets are saved with the same checksum. You can investigate side effect further.

More information: When I download a remote image on iOS 16.7 from a different iPhone, I download the same remote image without issue. However, the problem persists when the image is a .jpg taken with an iPhone. PHAssetCreationRequest may work differently on each iOS version.

Your package is excellent. Thank you for your dedication.

[AlexV525]

@dvbthien Could you verify if https://github.com/fluttercandies/flutter_photo_manager/pull/1194 fixes the issue?

[dvbthien]

@AlexV525 I'll test it and let you know soon. Thanks

[dvbthien]

Hi @AlexV525, I have tested it, and it works perfectly. The issue has been resolved.