[cups] controlling media size / paper tray selection when printing to a class

I'm running Debian/Bookworm on an AMD64 system.

I've got a script that prints to class queue - "photo" - which has 3 
actual photo printers in it. The printers are all different except that 
they are made by Epson. One is an old R300, the second is an XP-820 and 
the third is an XP-6100. The first just has one paper feed while the 
other two should be auto-selecting the tray based on media.

I have a script that controls a camera to take and download a picture 
then rotate and crop it before sending it to the printer (size according 
to GIMP is 4" x 6" @600dpi). This worked fine until I added the third 
printer and bought a new laptop.

The old R300 uses a CUPS+Gutenprint driver while the XP-820 used the 
Epson Inkjet Printer Driver (ESC/P-R) for Linux - which somehow survived 
upgrading over the years. However when I installed Linux on the new 
laptop, I had to install Debian/Bookworm - Debian/Bullseye had too many 
issues. I've got the CUPS+Gutenprint driver now because the Epson 
drivers wouldn't install. For some reason photos printed on the XP-820 
with the new driver are distinctly yellowy.

The real problem however is the XP-6100, which doesn't have a Linux 
driver so I installed it as an ipps (IPP Anywhere) printer. It prints a 
beautiful CUPS test page on Letter and 4x6.borderless photo paper. 
However when I print a photo to it, it insists on printing on letter 
size paper - scaling the photo up to file the page.

The CUPS default options are "4x6.borderless" glossy photo paper 
printing cropped to fit. However, when I send a photo to it using

     lpr -P photo <photo name>.jpeg

which works on the other two printers, I get letter-size output. Even if 
I remove the paper from the letter-size tray, it still wants to print 
from it.

I thought of adding a paper size definition to the lpr command but the 
first two printers (in their PPDs) have a "4x6" size for borderless 
printing while the XP-6100 uses "4x6.Borderless" - the "4x6" size has a 
border. That would mean I didn't get the same output from all three 
printers.

Can anyone suggest a way I can get all three printers to print the same?


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