 Local offices or regional contractors would then be said to opt out of this feed when they switch to feeding the transmitter(s) with locally originated content and to opt in when returning to a national feed.Opt-ins and opt-outs were often quite noticeable in earlier days for causing the picture distortion such as jumping and rolling as the feed was switched; such effects are still noticeable today, though less obvious.Whilst the BBC originated its network feed from the same place (Television Centre) ITV in earlier days would originate its feed from the broadcaster which made the programme.