Bitmap.compress doesn't decrease the Byte count

I need to compress an image to send it to my server. I am trying to do it this way:

private Bitmap compressImage(Bitmap bitmapImg){
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    bitmapImg.compress(Bitmap.CompressFormat.JPEG, 50, out);
    Bitmap compressed = BitmapFactory.decodeStream(new ByteArrayInputStream(out.toByteArray()));

    return compressed;
}

But when I compare the Byte count of the original Bitmap object and the compressed one, I get the same number:

Log.e("UNCOMPRESSED", Integer.toString(mBitmapImg.getByteCount()));
E/UNCOMPRESSED: 23970816
Log.e("COMPRESSED", Integer.toString(compressedBitmapImg.getByteCount()));
E/COMPRESSED: 23970816

How can I fix this to have a smaller file?