Digital BW, The Print

Nick,

Glad the tutorial was of help and that you like the program.  I love 
it.

IJC will accept density or L* readings directly.  No need at all to 
convert from L* to density.  If you use L* readings, you leave the 
slider on the left hand side of the graph set to "0", which plots 
your Aim points in a straight line.  This is appropriate for linear 
L* readings.  

If you do choose to input density, which is based on a logarithmic 
scale, you need to move the slider to the left of the graph so that 
step number 13 reads somewhere around 0.63 to 0.70 density.  This 
applies a logarithmic gamma curve which is appropriate for density 
readings.  You may want step 13 to be closer to 0.70 when using 
glossy papers with a very high Dmax (2.2, 2.4, etc), and try setting 
it to around 0.63 for low Dmax papers, such as matte art papers.  
This gets the density of your midtones about right.

I haven't figured out how to get density readings directly from 
EyeOne Share, but will take a look now that you mentioned it.  I was 
wondering if the GM software allowed you to do that.

I haven't tried using the paper offsets, since mine seems to be right 
on.  You may have to ask Bowhaus.  

I'm getting some fantastic results just with the Epson UC inkset.  
Can't wait to try dedicated B&W inks, but I want to get another 
printer before converting my 2200 to dedicated B&W.  I'm not 
interested in switching back and forth, as I do a lot of color.

Lou

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Nick H. Nugent" 
<nghin@p...> wrote:
> 
> 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