QTR-Quadtone RIP

I can share that with you. I have not too long ago switched from a 3800 to a 3880, but I still have 3800 profiles. It will be easy if you are using a Mac, an extra step or 2 if you are on Windoze. 

One thing you should be aware of, and the reason that sharing profiles is not as easy as you might expect, is that there are a lot of personal variables in Pt/Pd printing and each profile assumes a particular set of variables. Changing paper or developer, or the coating mix will likely require reproofing to get optimum results. 

This list doesn’t allow attachments so I can send you the file directly if you’d like, or you can copy and paste the following into a text file. 


#Notes Profile for Pd with 1 drop 2.5% Na2Pt per 2ml developed in KOx at 120° 
#Notes (or equivalent such as Pd developed in KOx #1 NaDichromate) on Arches Platine.

PRINTER=Quad3800
CURVE_NAME=3800pK-POHP-BL-Pd-4
GRAPH_CURVE=YES

N_OF_INKS=8
DEFAULT_INK_LIMIT=60

BOOST_K=60
LIMIT_K=50
LIMIT_C=5
LIMIT_M=5
LIMIT_Y=12
LIMIT_LC=5
LIMIT_LM=5
LIMIT_LK=60
LIMIT_LLK=80

N_OF_GRAY_PARTS=3

GRAY_INK_1=K
GRAY_VAL_1=100

GRAY_INK_2=LK
GRAY_VAL_2=40

GRAY_INK_3=LLK
GRAY_VAL_3=10

GRAY_HIGHLIGHT=2
GRAY_SHADOW=6
GRAY_OVERLAP=

GRAY_GAMMA=1

GRAY_CURVE=“0;0 100;100”

N_OF_UNUSED=0
COPY_CURVE_C=K
COPY_CURVE_M=K
COPY_CURVE_Y=K
COPY_CURVE_LC=LK
COPY_CURVE_LM=LK


One thing I’d like to note is that since switching to the 3880, I have been making use of the GRAY_GAMMA field, which previously I had left set at the default setting of 1. Going off something I remembered Clay Harmon mentioning a while back, I experimented a bit with changing gray gamma to 0.9, 0.8, 0.7, and 0.6 which I then plotted and compared. I found 0.8 and 0.7 to be very useful, making the correction curve even gentler than it already was. If you want to use this, simply the 1 to 0.8 or 0.7 in the GRAY_GAMMA field. 

I have also gotten away from linking the GRAY_CURVE field to an external file, and prefer instead to enter the curve points directly. It just makes keeping track of things a little easier.

Hope this works for you,
Keith

Keith Schreiber
jkschreiber.com




> On Jan 28, 2016, at 11:21 PM, kayeffdubphoto@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
> 
> 
> I've been struggling to understand how to create an ink descriptor file (profile) for OHP.  I'm making negatives for alt process (pt/pd) printing.  I have samples for a 3880, and I know how to make and measure the linearization curve in photoshop, but I'm stuck on creating the "no curve" profile.  Can anyone point me to one?  Thanks!
> 
> 
>