Status in upstream github is closed wontfix. The reason is that ppi is defined as an integer, and the cups-filters usage is broken.
Reported the issue to cups-filters at https://github.com/OpenPrinting /cups-filters/issues/347 ** Bug watch added: github.com/OpenPrinting/cups-filters/issues #347 https://github.com/OpenPrinting/cups-filters/issues/347 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to cups in Ubuntu. https://bugs.launchpad.net/bugs/1917074 Title: cups ppi parameter should be a string Status in CUPS: New Status in cups package in Ubuntu: New Status in cups-filters package in Ubuntu: New Bug description: cups encode.c treats parameter ppi as an integer, but it should be a string. the image filter drivers expect the form ppi=300x600 to specify source image dpi for images where it is asymmetric. I encountered this issue trying to print full-sized images without scaling on a dymo 450 label printer. This bug causes images to print across 2 labels when trying to use the 300x600dpi graphics mode. This should print a single label: lpr -o ppi=300x600 -o scaling=0 -o PageSize=w167h288 -o PageRegion=w167h288 -o Resolution=300x600dpi -o DymoHalftoning=Default -o DymoPrintDensity=Medium -o DymoPrintQuality=Graphics -o MediaDimensions=w167h288 ~/Desktop/test_Graphics_portrait.png where the png is a 664*2224 image without any dpi metadata. Instead the ppi option gets sanitized to 300, and the image gets printed across 2 labels. Description: Ubuntu 20.04.2 LTS Release: 20.04 cups: Installed: 2.3.1-9ubuntu1.1 Candidate: 2.3.1-9ubuntu1.1 Version table: *** 2.3.1-9ubuntu1.1 500 500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages 500 http://archive.ubuntu.com/ubuntu focal-security/main amd64 Packages 100 /var/lib/dpkg/status 2.3.1-9ubuntu1 500 500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages To manage notifications about this bug go to: https://bugs.launchpad.net/cups/+bug/1917074/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
