[Help] Get File from thumbnail

[momoDragon]

Is there a way to get file from the thumbnail?

tried this but doesn't work

          Uint8List? list = await assetEntity.thumbDataWithSize(400, 400);
          File file = File.fromRawPath(list!);

[vishnukvmd]

You can create a new File object at a desired path, and call writeAsBytes with the thumbnail data.

[momoDragon]

Yea i tried that and it works, but seems like i would store double the files. one from the package itself when it creates thumbnails and then another copy of my own in the temp directory. Can it be a feature request to have a method like getFileFromThumbnail() ?

[vishnukvmd]

You could perhaps delete the one you have generated after you've made use of it?

If you could explain your exact use case, it would make it easier to suggest a solution.

[momoDragon]

My use case is that i need File as input for google_ml_kit package for ML processing. My concern is not just the space but also the time taken for saving the file. it would definitely be faster if i can get access to the thumbnail file directly, rather than writing to file then reading it again. I am trying to optimize the process because there can be scenarios of 100s of images.

[AlexV525]

AFAIK the InputImage accept Uint8List.

[momoDragon]

yes i am aware of that too but i am not sure about InputImageData https://pub.dev/documentation/google_ml_kit/latest/google_ml_kit/InputImageData-class.html. Particularly these inputImageFormat → InputImageFormat Format of the input image. final planeData → List<InputImagePlaneMetadata>? The plane attributes to create the image buffer on iOS. [...] final

[momoDragon]

Bytes do not have these data. And also AssetEntity might not have all of it either

[AlexV525]

You can use the .file getter at present for your request, though it didn't provide any thumbnail options.

[momoDragon]

You can use the .file getter at present for your request, though it didn't provide any thumbnail options.

Yup i tried that too but the file is unnecessarily large, causing ML Kit results to be slow. So for my case, using the full file is not an option.

[AlexV525]

tried this but doesn't work

          Uint8List? list = await assetEntity.thumbDataWithSize(400, 400);
          File file = File.fromRawPath(list!);

Regarding the first question, how it behave when you said doesn't work?

[momoDragon]

   Uint8List? list = await assetEntity.thumbDataWithSize(400, 400);
      File file = File.fromRawPath(list!);

      print(file.path);
      print(await file.readAsBytes());

Output:

[AlexV525]

Can you make a minimal repo that includes ML Kit and this plugin to reproduce this issue?

[TylerKerch]

Hello, were you able to come up with a solution? I have the same use-case of wanting to use a file with ml kit but without the lengthy load times of .file with large files.

[AlexV525]

See comments above. InputImage accepts Uint8List.