[Gimp-print-devel] Problem driver Canon SELPHY DS810 - CUPS+Gutenprint v5.3.4 (color)

[Morgan Le R. <mor...@gm...>]

Hello Gutenprint team,

I am using a Canon Selphy DS810 printer. It works perfectly under 
Windows XP with the original Canon drivers, but I am trying to use it 
with CUPS on Ubuntu 24.04 LTS.

With the driver /“Canon SELPHY DS810 - CUPS+Gutenprint v5.3.4 (color)”/, 
the printer works correctly in general: Cyan, Magenta, Yellow, Red, 
Green, and Blue color patches are rendered as expected. However, the 
black patch (K) is printed as brown instead of neutral black. Grayscale 
gradients look correct, but pure black does not.

I will attach a photo of the test print to illustrate the issue.

Since the Selphy DS810 uses a ribbon with only Cyan, Magenta, and Yellow 
dyes (no dedicated black channel), I wonder if this issue could be 
related to how the driver handles the black generation or color model 
conversion.

Could this be a limitation or bug in the current Gutenprint driver for 
this printer model?

Thank you very much for your work on Gutenprint, and for any advice you 
can provide.

Best regards,