computes.dart

 onPressed: () async {
  img.Image copyRotate(img.Image? image) {
    return img.copyRotate(image!, 90);
  }

  CustomDialogs.loadingDialog(context: context);
  img.Image fixedImage;
  final capturedImage = await compute(img.decodeImage, state.model.backImage!);

  fixedImage = await compute(copyRotate, capturedImage);
  final Uint8List fixedFile = Uint8List.fromList(await compute(img.encodeJpg, fixedImage));
  context.read<VaccineVerificationBloc>().add(UpdateModelVaccineEvent(
      typeFile: state.model.typeFile!, isWeb: state.model.isWeb, backImage: fixedFile));
  // Close Loading
  Navigator.pop(context);
},