A quick way to reproduce this issue is:

Open lib/doc/ja/EmbeddedObjects.lyx and compile with the default format.

What happens for you?

For me, I was many errors that image sizes could not be determined. When
I looked in the temporary directory, I saw that eps files were there
that had 0 bytes. The problem is that I guess this output format needs
EPS files so LyX tries to convert PNG to EPS files (if you look in
ja/clipart you will see that there are only PNG files).

There are a couple of issues:

1. Why don't I get a "converter not defined" error? Why are .eps files
with 0 bytes created? Perhaps LyX uses a fallback (Qt?) and doesn't
detect that the fallback did not work well?

2. What is the ideal behavior in this case? As a user, I am glad that we
don't define a PNG to EPS converter. Should we give a warning that
conversion from PNG to EPS should be avoided if possible and brief
explanation of vector and bitmap formats?

Scott

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