Come to find out Xubuntu 18.04 ratcheted the ImageMagick security settings up to a dangerous chattering whine:
convert p???.jpg "Machining D-bit Drills.pdf" convert-im6.q16: not authorized `Machining D-bit Drills.pdf' @ error/constitute.c/WriteImage/1037.
Fortunately, someone who understands this stuff encountered the problem before I did and posted a great description of the solution.
To forestall link rot, the process looks like:
cd /etc/ImageMagick-6/ sudo cp policy.xml policy.xml.base sudo nano policy.xml … change one line … policy domain="coder" rights="read|write" pattern="PDF"
It is completely unclear to me whether ImageMagick (as of ImageMagick 6.9.7-4 Q16 x86_64 20170114 ) requires or merely tolerates the vertical bar in place of commas, nor whether it’s in my best interest to replace "coder" with "*".
In any event, I can once again stuff bitmap images into PDF files.
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#1 by scruss2 on 2018-12-03 - 18:58
Or use img2pdf – https://gitlab.mister-muffin.de/josch/img2pdf – almost always results in smaller files and makes it easy to add PDF metadata. It’s a great way of archiving JPEGs, as all the metadata are retained and the original files can be extracted using pdfimages
#2 by Ed on 2018-12-03 - 20:18
So many utilities, all doing much the same thing, only differently!
Thanks for the suggestion: when this happens again, I’ll (try to) learn something new again.