关于android：自定义相机的画质差

Poor picture quality from Custom Camera

当前我正在使用自定义相机应用程序，预览看起来还不错。但是，当我拍摄照片并将其显示在其他活动中时，照片却减少了80％。有人知道为什么会这样吗？同样在画廊里，质量很差。
我正在使用android的Camera API演示。

我的参数：

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public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
parameters = mCamera.getParameters();

parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
parameters.setFlashMode(Parameters.FLASH_MODE_AUTO);
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
parameters.setJpegQuality(100);
parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
parameters.setRotation(90);
Display display = ((WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
if (display.getRotation() == Surface.ROTATION_0) {
mCamera.setDisplayOrientation(90);
} else if (display.getRotation() == Surface.ROTATION_270) {
mCamera.setDisplayOrientation(180);
}

mCamera.setParameters(parameters);

mCamera.startPreview();
}

代码保存图像：

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private PictureCallback mPicture = new PictureCallback() {
private String TAG ="DocsPro";

@Override
public void onPictureTaken(byte[] data, Camera camera) {

File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null) {
Log.d(TAG,"Error creating media file, check storage permissions : PICTURE FILE IS NULL");
return;
}

try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
String filepath = pictureFile.getAbsolutePath();
Intent edit = new Intent(TakePhoto.this, EditPhoto.class);
edit.putExtra("filepath", filepath);
startActivity(edit);
finish();
} catch (FileNotFoundException e) {
Log.d(TAG,"File not found:" + e.getMessage());
} catch (IOException e) {
Log.d(TAG,"Error accessing file:" + e.getMessage());
}
}
};

private static File getOutputMediaFile(int type) {
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.

File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES),"DocsPro");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.

// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d("MyCameraApp","failed to create directory");
return null;
}
}

// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"IMG_" + timeStamp +".jpg");
} else {
return null;
}

return mediaFile;
}