[pdftex] Multiple references to image fails.

[John Culleton]

Early in the document I have:
\hskip .25in 
\pdfximage width 2.5in{snapshot9.png} 
\edef\firstimage{\the\pdflastximage}
\pdfrefximage\firstimage \hskip .25in
...and that works as expected.

I use some more images.
On a later page  I have:
 
\singlecolumn
\vskip .5pt
\pdfrefximage\firstimage 
\vskip.5pt

...and it fails with 

Overfull \vbox (72.4397pt too high) detected at line 221
! Undefined control sequence.
l.223 \pdfrefximage\firstimage

My question: how do I reuse this image without reloading it again?

John Culleton
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