QTR-Quadtone RIP

Hi,

When I try to linearize my printer/paper/ink combination (2100/Innova Photo Smooth/
Piezography K7neutral), I run into a problem. This inkset has 7 shades of grey.

First, I have made the descriptor file, which I copied at the end of this post. After I have 
processed this file, I open the Step-21-gray.tif image in the Eye One folder and convert it's 
profile to QTR-RGB Lab. Then I print this file, using the QTR-RGB matte paper profile, and 
select the newly created .quad file. The print looks okay, but it needs to be linearized. I 
read the density of the patches (X-rite 408). Up to the 95% patch, the density increases 
(95%=1.64). So fas no problem. But the 100% patch drops in density to 1.55. How can this 
happen? The ink separation print gives me 1.68 for the most black K patch!

I have also tryed to print the file with the RGB1998 profile (instead of QTR RGB Lab) and no 
printer profile: same result. I did create profiles in the past, with good results, but this is 
new to me.

I could spend hours finding the problem, but someone must have experienced this before.

Anyone?

Cheers, Piet Weber

PRINTER=QUAD2100-PK7
CALIBRATION=NO
GRAPH_CURVE=YES

DEFAULT_INK_LIMIT=60

LIMIT_K=
BOOST=95
LIMIT_C=
LIMIT_M=
LIMIT_Y=
LIMIT_LC=
LIMIT_LM=
LIMIT_LK=

N_OF_GRAY_PARTS=1
GRAY_INK_1=K
GRAY_VAL_1=100

GRAY_INK_2=LK
GRAY_VAL_2=30

GRAY_INK_3=C
GRAY_VAL_3=21

GRAY_INK_4=LC
GRAY_VAL_4=11

GRAY_INK_5=M
GRAY_VAL_5=4

GRAY_INK_6=LM
GRAY_VAL_6=2

GRAY_INK_7=Y
GRAY_VAL_7=1

GRAY_HIGHLIGHT=6
GRAY_SHADOW=8

GRAY_GAMMA=1
GRAY_CURVE=

LINEARIZE=