[cups] turning off fit-to-page

I'm running Debian/Bookworm on an AMD64 server. I'm usually trying to 
print to a HP CP1215 colour laser printer.

CUPS has been a nightmare for the past year, but I get around it a 
little by printing from the command line. My workstation can't seem to 
print to the server's printers anymore so I have been working around it 
by creating a PDF or image file and using lp to print from the server.

However this doesn't work when I have a document that extends into the 
printer margins. Then lp shrinks the document to fit the margins, which 
is not what I want. I want the printer to crop at the margins so I get 
as much of the document as the printer allows without any alterations 
and without having to create a separate document for each printer I 
might use.

This brought me to the barely documented option "fit-to-page" which 
(apparently) is turned on by default so that iOS users can air print 
their photos. I supposedly should be able to override this by setting 
fit-to-page=off. I supposed to be able to do this using the lpoptions 
command or specifying it on the lp command using "-o fit-to-page=off".

Neither worked.

If I use lpoptions as either my regular user or as root, it has no 
impact - using loptions -p <queue name> -o fit-to-page=off or omitting 
the -p <queue name> - all 4 variants fail. However I did note some odd 
behaviour setting the lpoptions. When I list the options, fit-to-page 
never shows. However if I look at the lpoptions file, the global one 
only contains the default queue name while the local user one appends 
"fit-to-page-off=true" to the default line.

If I put the -o fit-to-page=off in the lp command, the jpeg file ends up 
printing over 4 pages, with about 1/4 of the image centred on each page 
- possibly full size but not what I expected or wanted or can use.

I will also note that running "lpoptions -l" never shows the 
"fit-to-page" setting but it does confirm that my default paper size is 
"letter". Nor is there a "fit to page" setting through the CUPS printer 
management page (<servername>:631). However, I used to print unscaled 
documents to this printer (just not through Gwenview which doesn't have 
a print full size & crop option, which was why I originally started 
trying to use lp).

Is there a way I can get this to work?

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