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convert -density 300 -trim test.pdf -quality 100 test.jpg

Convert from jpg to pdf If you have images of different sizes, adding the option "-define pdf:use-trimbox=true" seems to allow the pages within the pdf to be different sizes too. I had some pictures in landscape and some in portrait and wanted to maintain that without distortion in my pdf, so this did the trick:

convert -define pdf:use-trimbox=true *.JPG new_pdf.pdf