I have no HP Printer at all, but the same result. As such I think it's OpenOffice which does the wrong think rather then the hplip (might have similar bug)
My printer is Samsung CLP610ND and when I select grayscale in prtinter dialogue OR Tools/Options/Print/Convert colors to grayscale, the printer acutally uses composite of CMY rather then the K toner. From a point of view this is actually much worsre then just go ahead and print in color!!!!
This bug shall be assigned to the openoffice team, I have a look at Openoffice bugs, if they are aware or working on it.
I have no HP Printer at all, but the same result. As such I think it's OpenOffice which does the wrong think rather then the hplip (might have similar bug)
My printer is Samsung CLP610ND and when I select grayscale in prtinter dialogue OR Tools/Options/ Print/Convert colors to grayscale, the printer acutally uses composite of CMY rather then the K toner. From a point of view this is actually much worsre then just go ahead and print in color!!!!
This bug shall be assigned to the openoffice team, I have a look at Openoffice bugs, if they are aware or working on it.