On Thursday, 14 Jun 2018 at 16:40, Loris Bennett wrote:
> Hi,
>
> For a beamer slide I'd like to have a 2D array of a single PNG-image
> (the single image is a desktop computer, the array is intended to
> represent a cluster of computers).  I could presumably just create a
> LaTeX table and include the image in each cell.

This is what I did in a recent (well, 3 years ago now) talk.  I had a 4
column table where each entry in odd numbered rows was an image and the
even numbered rows were captions for the image above each caption.  I
had this line just before the table:

  #+attr_latex: :align p{2.25cm}p{2.25cm}p{2.25cm}p{2.25cm} :font \tiny

The image links were file:xxx.png with no description element.  Worked
perfectly fine.

Screenshot of part of the slide attached for illustration.