Stop further output after showing full screen image

Question

In beamer presentation I have a slide like this

\begin{frame}
  \begin{itemize}[<+->]
    \item My first point   \fullscreenimage<+>{Image1.png}
    \item My second point  \fullscreenimage<+>{Image2.png}
  \end{itemize}
\end{frame}

here I would like to uncover each item at a time showing a full screen image after each new item. So the sequence should look like this:

<1>
  +---------------------------+
  |  * My first point         |
  |                           |
  |                           |
  |                       3/6 |
  +---------------------------+
<2>
  +---------------------------+
  |///////////////////////////|
  |///////// Image 1 /////////|
  |///////////////////////////|
  |///////////////////////////|
  +---------------------------+
<3>
  +---------------------------+
  |  * My first point         |
  |                           |
  |  * My second point        |
  |                       3/6 |
  +---------------------------+
<4>
  +---------------------------+
  |///////////////////////////|
  |///////// Image 2 /////////|
  |///////////////////////////|
  |///////////////////////////|
  +---------------------------+

My problem is, that after showing the full screen image, the beamer continues to output stuff from the page, like grayed out items yet to be uncovered and the footer of the page, like this:

<2>
  +---------------------------+
  |///////////////////////////|
  |///////// Image 1 /////////|
  |////grayed out items///////|
  |////////////////////// 3/6 |
  +---------------------------+

I know, that

\begin[plain]{frame}

partially solves the page footer problem. But it removes footer for all slides, not only for the full screen slides.

What I'm looking for is some command, that would instruct beamer to stop any further output to the page (or make is 100% transparent):

\begin{frame}
  \begin{itemize}[<+->]
    \item My first point
      \only<+>{
        \fullscreenimage{Image1.png}
        \STOPrendering
      }
    \item My second point
      \only<+>{
        \fullscreenimage{Image2.png}
        \STOPrendering
      }
  \end{itemize}
\end{frame}

My questions are:

• How to hide all further text for the current slide?
• How to add overlay specification to the [plain] frame option?
• How to change itemize overlay uncover transparency for the current slide?

Answer 1

A solution using textpos:

\documentclass[11pt]{beamer}
\usepackage[absolute,overlay]{textpos}
\TPGrid{1}{1}
\begin{document}
\begin{frame}
  \begin{itemize}
    \item<1,3> My first point   
    \item<3> My second point  
  \end{itemize}
\begin{textblock}{1}(0,0)
\includegraphics<2>[width=\textwidth]{example-image-a}
\includegraphics<4>[width=\textwidth]{example-image-b}
\end{textblock}
\end{frame}
\end{document}