Paul A. Rubin writes:

> 
> You might try the following.
> <SNIP>
> Good luck!
> 
> Paul
> 
> 

Hi Paul,

Thank you for the very detailed instructions.  Looking at the debug output, it 
became clear that Lyx went through the entire list of 10 or so converters 
(ending with xpm) and failed to find any way to convert a PDF (graphics) file 
to one of those formats.  It ended up trying to use the default converter 
convertDefault.py.

Looking at the list of Converters, I confirmed that, indeed, there was no 
converter that started with "PDF (graphics)" !!! This was quite surprising to 
me.  I had no 'pdftops' binary.  After some searching, I realized that comes 
with xpdf, or now poppler.  I could have installed either of those through 
MacPorts and gone on my way.

Instead, I quickly found the Mac page on the Lyx wiki 
(https://wiki.lyx.org/Mac/Mac) and followed the instructions there for "On 
screen quality of included PDF files", namely defining a new converter to use 
the Mac's builtin "sips" function (of which I had not been aware).  Doing that 
led to the PDF image converting to PNG quite nicely, problem solved.

Thanks again for pointing me down the right path.

Derek

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