%
\shipout\vbox{
\vbox to5cm{}
\special{pdf:image @jpegpic (image.jpeg)}
\special{pdf:uxobj @jpegpic}
}
\advance\count0 by 1
%
\shipout\vbox{
\vbox to5cm{}
\special{pdf:image @pngpic (image.png)}
\special{pdf:uxobj @pngpic}
}
\advance\count0 by 1
%
\shipout\vbox{
\vbox to5cm{}
\special{pdf:image @pdfpic (image.pdf)}
\special{pdf:uxobj @pdfpic}
}
\advance\count0 by 1
%
\bye
