Digital BW, The Print

Hi Lou,

Thanks for writing the tutorial. I may have purchased this software 
even before you did but never got around to using it due to my 
preoccupation with some other inkjet printing issues.

Your tutorial along with feedback from other forum members prompted 
me to give it a try and it sure is fantastic. I just tried it on a 
1160 using MIS FS Ultratone inkset on some cheap 24 lb letterhead 
type paper just to see how the whole thing works.

After setting limits for each ink, I just use the default quad tone 
ink tweaks for black, dark grey, mid grey, and light grey, and  
printed a target for linearization, read the 26 levels using Eye One 
and copy them to IJC and I got a perfect profile all in one shot. 

There is though a mystery in the using of Eye One for linearization. 
Earlier I had to use a complicated formula for converting the 
reading to convert a Lab lightness value to density. Something like:

y = ((L+16)/116)^3 if L > 7.9996248
y = L/903.3 if L <= 7.9996248
Dmax = log10(1/y)

But last night as I took the reading using Gretag EyeOne Share 
software I got the density value directly without having to do any 
conversion. What's going on? I must have changed something which now 
enables the software to do what I wanted it to do all along.

Also do you have any idea why the offset values from paper edges 
don't seem to work in OPM? OR maybe it does work with a real image. 
I just tried printing a target with linearization so that may be the 
case.

Anyway, thanks for the helpful info. Now I don't have to worry too 
much about trying out different papers, or even trying new inksets.

--nick


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "ldina" 
<lbdina@c...> wrote:
> 
> For those of you who own, or ar considering the purchase of 
> IJC/OPM, I have written a tutorial and posted it in the "Files" 
> section of this forum, in the IJC/OPM folder.
> 
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/ 
> ...
> Lou Dina