Android : Poor picture quality from Custom Camera

Currently i'm using a custom camera application, the preview looks just fines. But when i take the picture and display it in my other activity the picture has decreased with like 80%. Anyone knows why this is happening? Also in gallery the quality is poor. I'm using the Camera API Demo from android.

my parameters :

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();
}