Public bug reported:

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

** Affects: cups
     Importance: Undecided
         Status: New

** Affects: cups (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: cups-filters (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: focal groovy

** Also affects: cups-filters (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: cups
   Importance: Undecided
       Status: New

** Tags added: focal groovy

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https://bugs.launchpad.net/bugs/1917074

Title:
  cups ppi parameter should be a string

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