Yes, the empty color cartridge is my "last resort" thing to try (when I'll
purchase it), I forgot to mention it that way.
I do have a "Color" tab, but inside I have "Color Model" with the following
options:
Grayscale
Inverted Grayscale
RGB Color (default option)
CMY Color
CMYK
KCMY
And in the "Advanced" I have "Ink Type" that has the Black option,
along the default "CMYK Color", "CMY Color" and "Photo CcMmYyKk Color"
options.
I played with several of these already, no change at all when it's a PDF at
least.
I'm gonna try with a jpeg. And get a color cartridge.
Other than that, any additional ideas are more than welcome.