Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "evanj1969" 
<evanj69@...> wrote:
...

> > Actually, QTR allows for better control. ... 
> 
>  so if I understand correctly:
> 
>  YES, I will have the same amount of control over each ink (or jet) 
> limit and curve shape, the same as I do in IJC, but just with more 
> points to actually manipulate.

If you want them.  I've never used all of the QTR points, whereas I 
found myself wanting more points in IJC.

> it's just and issue of the interface 
> being a numerical interface vs. a graphical interface?

Yes. 


>  based on your comments, I take it you prefer QTR at this 
> point over IJC/OPM?
> 
>  is all of the above correct?

Yes.



> 
> 
> > It does take some experience to learn how to do the work 
> > using the points list.  It has a curve preview that is 
> > very useful, but  beware that the smoothing algorithm is
> > not previewed.  As such, you have  to 
> > look carefully at the final curves set that is displayed
> >  when you make the profile.  That will show whether the 
> > smoothing algorithm  has done something unexpected.
> 
> I'm not sure I understand what you mean there. could you elaborate??

These programs usually if not always attempt to smooth the curve 
you've written.  Sometimes these attempts, rather than smooth the 
curve, throw a bulge or other un-wanted artifact into the curve that 
is not in your interest.  (I almost wish I could turn the algorithms 
off, but that has not been an option in the programs I've worked 
with.)  So, the bottom line is to just inspect the final curves set 
very carefully to be sure it looks smooth and the way you intended it.

If there is a bulge or spike that is un-intended, that is where the 
high resolution of QTR can really pay off.  I sometimes put in a 
points that are only one integer apart so that I, in effect, manually 
take over how the curve will make a sharp turn.

This is just one of those things you learn about each program as you 
use it.  Suffice it to say, QTR's high number of points and very fine 
(16 bit curves) "resolution" in the interface really allow great 
control over the curves. 

>  just curious, what do you consider IJC/OPM's strengths 
> (aside from the graphical interface)?

That's pretty much it.  Actually, I think one of the greatest 
strengths that both programs enjoy is the quality of the individuals 
who write them.

Paul
www.PaulRoark.com