I would like to know if the LK and LLK inks are used in making color prints with the Epson 7800, when printing with the Epson driver and ICC profiles?
What I would like to do is put darker shades of black (like Epson PK or Cone Opaque Black) in the LK and LLK slots to give more UV blocking inks in the printer for a QTR profile for making digital negatives, but hesitate to make this change if it makes printing in color impossible.
Sandy,
A couple of weeks ago my 3880 suddenly quit using all three black inks. I make very brown monochrome prints, but do not use ABW. Theoretically, with the black inks out of the picture, I should have seen nothing but magenta and yellow in the resulting print. Not the case. To my great surprise there was a very heavy deposit of cyan plainly visible in the darker parts of the resultant image. I would never have known all that cyan was getting laid down in brown prints, if the blacks had not all stopped working at once. Whatever math Epson is using, it apparently includes all the inks, all of the time.
(No wonder neutral gray B&W didn\u2019t work very well before ABW.)
I don\u2019t know for sure, but I feel very confident making the guess that LK and LLK are used in all color prints.