How to fix wrong rotation of photo from camera in flutter? - flutter

Question

I'm taking a photo with the newest camera plugin version and I'm using code from flutter example. This is how I pick a camera:
final cameras = await availableCameras();
final firstCamera = cameras.first;
This is inside init:
_cameraController = CameraController(
widget.camera,
ResolutionPreset.medium,
enableAudio: false,
);
This is the rest of the relevant code:
Future _takePhoto(BuildContext context) async {
try {
await _initializeControllerFuture;
final path = join(
(await getTemporaryDirectory()).path,
'${DateTime.now()}.png',
);
await _cameraController.takePicture(path);
setState(() {
_imagePath = path;
});
} catch (e) {
print(e);
}
}
Afterwards, I show the photo to the user with Image.file(File(_imagePath)) and later I send the photo to API.
The problem is that the photo is sometimes captured with a wrong orientation. (I'm sure about this because the photo is also rotated in the database.) For example, on 3 years old Xiaomi phone, it works flawlessly, but on a certain new Samsung phone, the photo is always rotated.
How to make sure that the rotation is always correct? (Even on ios devices)

Answer 1

This worked for me:
import 'package:image/image.dart' as img;
...
final img.Image capturedImage = img.decodeImage(await File(path).readAsBytes());
final img.Image orientedImage = img.bakeOrientation(capturedImage);
await File(path).writeAsBytes(img.encodeJpg(orientedImage));

Answer 2

This is my solution that works cross-platform and doesn't use plugins.
import 'dart:io';
import 'package:exif/exif.dart';
import 'package:image/image.dart' as img;
Future<File> fixExifRotation(String imagePath) async {
final originalFile = File(imagePath);
List<int> imageBytes = await originalFile.readAsBytes();
final originalImage = img.decodeImage(imageBytes);
final height = originalImage.height;
final width = originalImage.width;
// Let's check for the image size
// This will be true also for upside-down photos but it's ok for me
if (height >= width) {
// I'm interested in portrait photos so
// I'll just return here
return originalFile;
}
// We'll use the exif package to read exif data
// This is map of several exif properties
// Let's check 'Image Orientation'
final exifData = await readExifFromBytes(imageBytes);
img.Image fixedImage;
if (height < width) {
logger.logInfo('Rotating image necessary');
// rotate
if (exifData['Image Orientation'].printable.contains('Horizontal')) {
fixedImage = img.copyRotate(originalImage, 90);
} else if (exifData['Image Orientation'].printable.contains('180')) {
fixedImage = img.copyRotate(originalImage, -90);
} else if (exifData['Image Orientation'].printable.contains('CCW')) {
fixedImage = img.copyRotate(originalImage, 180);
} else {
fixedImage = img.copyRotate(originalImage, 0);
}
}
// Here you can select whether you'd like to save it as png
// or jpg with some compression
// I choose jpg with 100% quality
final fixedFile =
await originalFile.writeAsBytes(img.encodeJpg(fixedImage));
return fixedFile;
}
Source

Answer 3

You can use package https://pub.dev/packages/flutter_exif_rotation
Support iOS and Android
In some devices the exif data shows picture in landscape mode when they're actually in portrait.
This plugin fixes the orientation for pictures taken with those devices.
For Android
Add this in your AndroidManifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
code snippet
image = await FlutterExifRotation.rotateImage(path: image.path);
//Note : iOS not implemented
image = await FlutterExifRotation.rotateAndSaveImage(path: image.path);

Answer 4

if you want to rotate image, you can use https://pub.dev/packages/image to manipulate images:
import 'package:image/image.dart';
If you use package "camera", you can't rotate image (remove mirror effect) using bakeOrientation because don't have exif data.
this works for me using "image_picker" or "camera".
File originalFile = File.fromUri(Uri(path: file.path));
List<int> imageBytes = await originalFile.readAsBytes();
final Image originalImage = decodeImage(imageBytes)!;
final Image orientedImage = flipHorizontal(originalImage);
List<int> imageBytesOrientated = encodeJpg(orientedImage);
For Write in same path:
await File(path).writeAsBytes(imageBytesOrientated);

Answer 5

You can use this package flutter_image_compress to resolve the camera image orientation problem. Note that this approach is faster than using the image package approach.
Use it this way:
import 'package:flutter_image_compress/flutter_image_compress.dart';
........
final fixedImageBytes = await FlutterImageCompress.compressWithFile(
image.path,
rotate: 0,
quality: 100,
keepExif: false,
autoCorrectionAngle: true,
format: CompressFormat.jpeg,
);
Note:
Make sure to set autoCorrectionAngle to true, keepExif to false and rotate to 0

Answer 6

I know this is late, but I just wanna to share how I fix my issue, you can call this function after it's initialized or every time before you take a photo, and here is the code:
await _camCtrl.lockCaptureOrientation(DeviceOrientation.portraitUp);
This fix my issue, somebody says it won't work on iOS, but I haven't test that it, so you can test it out and see if it is compatible with iOS or not.

Answer 7

A bit late to the party. It is really bad idea to ask Flutter to rotate images or similar operations because mobile apps are not designed for these purposes. The only reasonable use case is to ask Flutter to resize the image because you don't want to send a high resolution image to your server over the mobile connection. My solution is send your full size (if you prefer and resize in the back end) or resized images from Flutter to the back end where you can do auto orientation. I use MagickNET lib which is cross platform to do the job and it works perfectly. By doing this, your Flutter code is much cleaner and tidier.

Answer 8

--- VERY SIMPLE SOLUTION ---
import 'package:image/image.dart' as img;
XFile xfile = await _cameraController.takePicture();
List<int> imageBytes = await xfile.readAsBytes();
img.Image? originalImage = img.decodeImage(imageBytes);
img.Image fixedImage = img.flipVertical(originalImage!);
File file = File(xfile.path);
File fixedFile = await file.writeAsBytes(
img.encodeJpg(fixedImage),
flush: true,
);