Update on MIS PKN and LKN in the Epson 4000
2005-02-03 by Carl Schofield
The new MIS PKN and UT7 LK neutral inks are performing very well in my Epson 4000 for both B&W and color. I've tried PKN only printing with the Epson driver, PKN + LKN neutral profiles with both QTR and IJC/OPM, and PKN+LKN+LM+Y sepia profiles. All yield a dmax of about 2.46 on Kirkland Signature Glossy paper. I was surprised at how good the linearity was for the 4000 Epson driver printing BO with the PKN (compare density plots below for the linearized QTR PKN+LKN profile and Epson driver PKN only). After making some adjustments in the LKN:LM:Y ratios I also have a very nice sepia tone with deep, rich blacks. I'm still working with a mix of Epson UC inks in the color positions and MIS PKN and LKN so I won't re-profile all my papers for color until I have all inks switched over to the MIS UC equivalents. However, I did print the Kirkland with a new RGB profile and colors were very close to the original prints with straight UC inks so I don't expect any problems printing color with the neutral PK and LK inks. I'm also still evaluating different glop overlay application rates on the 4000 prints by running them through my 2200 and printing with a glop only overlay profile. My initial test were done with an IJC glop only profile (glop in 2200 LK slot) with glop ink limit set to 50%. There was almost no bronzing and only some slight gloss differential to begin with on the Kirkland PKN prints and after glop application both bronzing and gloss differential were completely gone. See last density plot below for post glop coated PKN+LKN print. Slightly higher dmin from the glop but a terrific dmax boost to the highest dmax (2.602) I've ever obtained for any ink/paper combo and beautiful artifact free gloss finish. I'm still considering my options for installing glop in the 4000 that will also enable me to print both B&W and color, but these prints are so good I'm leaning towards dumping matte paper printing completely and just using glop in the matte black slot for overcoating prints. The matte prints on cotton rag with dmax levels in the 1.7 range just look dull and pathetically weak next to these new RC prints. Carl QTR Profile for PKN + LKN: Step Density 0 0.053 ** 5 0.109 *** 10 0.168 ***** 15 0.234 ****** 20 0.305 ******** 25 0.369 ********** 30 0.444 ************ 35 0.523 ************** 40 0.607 **************** 45 0.687 ****************** 50 0.786 ******************** 55 0.893 *********************** 60 1.006 ************************** 65 1.130 ***************************** 70 1.263 ******************************** 75 1.401 ************************************ 80 1.567 **************************************** 85 1.740 ******************************************** 90 1.907 ************************************************ 95 2.161 ******************************************************* 100 2.456 ************************************************************** Epson driver PKN only: Step Density 0 0.051 ** 5 0.094 *** 10 0.147 **** 15 0.202 ****** 20 0.268 ******* 25 0.328 ********* 30 0.404 *********** 35 0.463 ************ 40 0.540 ************** 45 0.620 **************** 50 0.697 ****************** 55 0.789 ******************** 60 0.909 *********************** 65 1.022 ************************** 70 1.157 ***************************** 75 1.291 ********************************* 80 1.456 ************************************* 85 1.717 ******************************************* 90 1.928 ************************************************* 95 2.301 ********************************************************** 100 2.456 ************************************************************** QTR Profile for PKN + LKN+GLOP overlay: Step Density 0 0.061 ** 5 0.121 **** 10 0.181 ***** 15 0.244 ******* 20 0.313 ******** 25 0.376 ********** 30 0.452 ************ 35 0.527 ************** 40 0.608 **************** 45 0.686 ****************** 50 0.780 ******************** 55 0.882 *********************** 60 0.988 ************************* 65 1.108 **************************** 70 1.237 ******************************* 75 1.371 *********************************** 80 1.538 *************************************** 85 1.712 ******************************************* 90 1.886 ************************************************ 95 2.131 ****************************************************** 100 2.602 ******************************************************************