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convert -list formatinstead. I have JPEG2000 in the compress options but not in the formats, and the result isconvert -compress jpeg2000 00001.tif 00001.pdf convert: delegate library support not built-in00001.pdf' (JP2) @ error/pdf.c/WritePDFImage/1283.`jpeg:extent, e.g.convert -define jpeg:extent=400KB. imagemagick.org/discourse-server/viewtopic.php?t=15386convertis never lossless if you output to a lossy format. therefore this part is off-topic.