无法将CameraImage从bgra8888转换为jpeg。
我已经尝试了不同的方法，但都不起作用。
我最后尝试的是：
```dart
void testB(CameraImage i) async {
    cameraRepository.stopRecording();
    print(i.format.group);
    imglib.Image im = imglib.Image.fromBytes(
      width: (i.planes[0].bytesPerRow / 4).round(),
      height: i.height,
      bytes: (i.planes[0].bytes).buffer);
    imglib.PngEncoder pngEncoder = new imglib.PngEncoder();
    Uint8List png = pngEncoder.encode(im);
    //Uint8List jpeg = imglib.encodeJpg(im);
    imageList.add(png);

return Scaffold(
          appBar: AppBar(
            title: const Text('Test'),
          ),
          body: ListView.builder(
          itemCount: 1,
          itemBuilder: (BuildContext context, int index) {
            return SizedBox(width:500, height:500, child: Container(
              decoration: BoxDecoration(
                image: new DecorationImage(fit: BoxFit.cover, image: MemoryImage(BlocProvider.of<CameraBloc>(context).imageList[0], scale: 0.5)),
        )
            ));
          }),
        );

import 'package:image/image.dart' as imglib;
import 'package:camera/camera.dart';
Future<List<int>> convertImagetoPng(CameraImage image) async {
  try {
    imglib.Image img;
    if (image.format.group == ImageFormatGroup.yuv420) {
      img = _convertYUV420(image);
    } else if (image.format.group == ImageFormatGroup.bgra8888) {
      img = _convertBGRA8888(image);
    }
    imglib.PngEncoder pngEncoder = new imglib.PngEncoder();
    // 转换为png
    List<int> png = pngEncoder.encodeImage(img);
    return png;
  } catch (e) {
    print(">>>>>>>>>> ERROR:" + e.toString());
  }
  return null;
}
// CameraImage BGRA8888 -> PNG
// 颜色
imglib.Image _convertBGRA8888(CameraImage image) {
  return imglib.Image.fromBytes(
    image.width,
    image.height,
    image.planes[0].bytes,
    format: imglib.Format.bgra,
  );
}
// CameraImage YUV420_888 -> PNG -> Image（压缩：0，过滤器：无）
// 黑色
imglib.Image _convertYUV420(CameraImage image) {
  var img = imglib.Image(image.width, image.height); // 创建图像缓冲区
  Plane plane = image.planes[0];
  const int shift = (0xFF << 24);
  // 使用YUV420_888的plane[0]填充图像缓冲区
  for (int x = 0; x < image.width; x++) {
    for (int planeOffset = 0;
        planeOffset < image.height * image.width;
        planeOffset += image.width) {
      final pixelColor = plane.bytes[planeOffset + x];
      // 颜色：0x FF  FF  FF  FF
      //          A   B   G   R
      // 计算像素颜色
      var newVal = shift | (pixelColor << 16) | (pixelColor << 8) | pixelColor;
      img.data[planeOffset + x] = newVal;
    }
  }
  return img;
}

imglib.Image im = imglib.Image.fromBytes(
      width: (i.planes[0].bytesPerRow / 4).round(),
      height: i.height,
      bytes: (i.planes[0].bytes).buffer);

Please note that the code comments have also been translated for your convenience.
<details>
<summary>英文:</summary>
I cant convert CameraImage from bgra8888 to an jpeg.
I have found different approaches but none of them work.
The last what I tried is:

cameraRepository.stopRecording();
print(i.format.group);
imglib.Image im = imglib.Image.fromBytes(
  width: (i.planes[0].bytesPerRow / 4).round(),
  height: i.height,
  bytes: (i.planes[0].bytes).buffer);
imglib.PngEncoder pngEncoder = new imglib.PngEncoder();
Uint8List png = pngEncoder.encode(im);
//Uint8List jpeg = imglib.encodeJpg(im);
imageList.add(png);

When I display it in a widget like this:

I images shows up, but something is wrong with the conversion:
https://pasteboard.co/5yMYpLFxsPkR.jpg
(Thats my Keyboard, so the image isnt complete Noise).
I've tried this code:

imglib.PngEncoder pngEncoder = new imglib.PngEncoder();
// Convert to png
List<int> png = pngEncoder.encodeImage(img);
return png;

  img.data[planeOffset + x] = newVal;
}

But it seems outdated. Got different errors when i tried it.
**UPDATE**
    imglib.Image im = imglib.Image.fromBytes(
      width: (i.planes[0].bytesPerRow / 4).round(),
      height: i.height,
      bytes: (i.planes[0].bytes).buffer);
After changing height to width and width to height, the image is no clearer and almost good. I confused this as it seems.
But its still not good.
</details>
# 答案1
**得分**: 1
如果有人在iPhone上将此流式相机图像（brga8888）转换时遇到困难，由于图像包的新版本，参数已更改：
```dart
imglib.Image im = imglib.Image.fromBytes(
      height: i.height,
      width: i.width,
      bytes: (i.planes[0].bytes).buffer,
      format: imglib.Format.uint8,
      order: ChannelOrder.bgra
    );