front camera take very dark capture in android

I am taking photo capture using front camera using my custom camera app not using system camera app.But the captured photo is very dark so can see photo properly.

my code

mCamera = Camera.open(1);
Camera.Parameters params =mCamera.getParameters();
params.setSceneMode(Camera.Parameters.SCENE_MODE_NIGHT);
mCamera.setParameters(params);

And to take picture

if (mCamera != null) {
try {
 mCamera.setPreviewDisplay(mSurfaceHolder);
 mCamera.startPreview();
 mCamera.takePicture(null, mPictureCallback,
 mPictureCallback);
} catch (IOException e) {
 e.printStackTrace();
    }
}

Thanks in advance. Please give me suggestions. any help will be appreciated.