#731 Canon Selphy not printing 100% borderless

[KDM]

Hi all, my Canon Selphy CP1300 doesn't print borderless. There is always the tiniest off white border visible along the long edge, so it's not 100% boderless. The Canon Selphy is connected via wifi. I'm running Fedora 35 with Gnome41. I have cups and gutenprint 5.3.4 installed. I'm using the Canon SELPHY CP1300 - CUPS+Gutenprint v5.3.4 (color) driver.

When printing from the commandline using the command "lp -d Canon_SELPHY_CP1300 -o raw filename.jpg"
I get a decent print, colours are ok, just along the long edge, the tiniest of white margin/border is visible. I'm talking about a millimeter on both edges. Of course my image files are in the 3x2 aspect ratio.

From the cups admin page

Canon Selphy CP1300, connected via Wifi
Driver: Canon SELPHY CP1300 - CUPS+Gutenprint v5.3.4 (color)
Connection: ipp://192.168.1.63 (ip off the Selphy printer)
Defaults: job-sheets=none, none media=custom_105.66x158.5mm_105.66x158.5mm sides=one-sided

General Settings:
Media Size: Postcard 100x148mm
Color: RGG Color
Color Precision: normal
Shrink Page if necessary to Fit Borders: Crop (preserve dimensions)

Printer Features Common:
Borderless: yes

The other features in Output Control Common, Output Control Extra 2, Output Control Extra 4, Banners and Policies I left untouched.

I can only achieve a print using the command line. When printing from an application like XnView, Digikam, ... I only get a print when using the other driver: Canon SELPHY CP1300,driverless,cups-filters 1.28.10(en) driver. But using this driver I get the strangest of margins around the image, even when I have added the correct paper size. This driver doesn't allow me to set the margins to 0, also it sees the Hagaki paperformat as standard.

When using the Canon SELPHY CP1300 - CUPS+Gutenprint v5.3.4 (color) driver. I get a message on the printer saying "Cannot read data! Cannot print incompatible images or memory card not readable".

I circumvented both this issues by printing from the commandline. I even added the command to a bash script.
When I right-click on a jpg file and choose "Scripts" I can point to my bash script and the file gets printed. While this felt like a workaround, it's really convenient.

When printing from the command line, both drivers seem to work and I don't see any difference between the 2 drivers, but with both have a small border/margin along the long edge.

Any input is highly appreciated.