New answers tagged image-manipulation
It can be very complicated to get good pdf output from convert. Try img2pdf instead. From the readme: Lossless conversion of images to PDF without unnecessarily re-encoding JPEG and JPEG2000 files. Thus, no loss of quality and no unnecessary large output file.
Not sure if this is a researched question, but anyway, a small shell script can do something like: c=0 for i in *.jpg; do c=$(($c+1)) f="$f $i" test "$(expr $c % 30)" != 0 && continue gmic $f ... -o output-$c.jpg f="" done test -z "$f" || gmic $f ... -o output-$(($c+1)).jpg
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