Digital BW, The Print

Hi Dario,

 

Sorry I never got around to following up on this.

 

I think the context was working on the QTR curves.  What I did is simply do
a screen grab of the graph of the curves that the Curve Creator makes.  The
coordinates of that are easily put - one curve at a time - into PS .acv
curves, where your use the 0 - 100 format.  Then, for example, if you want
more of an overlap, you can do it in PS.  Or, if the automatic profiling
gave an un-linearized ramp that was off, you could correct that in PS.

 

While .acv curves can be imported into QTR, I find it very hard to keep
track of the curves if I want to do some more work on the profile later.
So, I simply copy the coordinates into the QTR Point List.

 

With the latest work I've been doing with QTR I'm finding that I make a
curve in PS that looks good, in general, and I just copy the points into the
Point List and give it a try.  Then I modify it as needed just by changing
the numeric values in the list.  I preview the curve as I work to be sure
it's smooth.  You do need to be a little careful of sharp turns or radical
curves in the preview, because I don't think it does any smoothing.  The
smoothing can cause unintended artifacts.  That is one reason to take a look
at the curve in PS first.  The final curves that are displayed when one hits
the Create Curve do seem to have the smoothing algorithms applied.  So, if
there is an artifact, you might pick it up there.

 

At any rate, as I become more familiar with QTR, I find I'm using PS curves
less.  The Point List with and preview are now working well enough that I
don't find much need for more. 

 

I hope this at least in part answered the question.

 

Paul

www.PaulRoark.com <http://www.paulroark.com/>  

 

 

  _____  

From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of
met.graphix
Sent: Wednesday, June 06, 2007 5:54 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: Re: [Digital BW] QTR profiling and partitioning

 

--- In DigitalBlackandWhit
<mailto:DigitalBlackandWhiteThePrint%40yahoogroups.com>
eThePrint@yahoogroups.com, "Paul Roark" 
<paul.roark@...> wrote:
>
> Hi Tom,
> 
> >Could you elaborate on your method for refining the .acv 
> >curves in photoshop and your method and criteria for evaluating them?
> 
> Yes, I might even be able to get to it tomorrow. (Hopefully before I
> forget.)
> 
> Paul
> www.PaulRoark.com
>

Hi Paul,

Just got around to trying this approach. Do you still remember how you 
were optimizing those curves in PS?

Thx,
Dario

 



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