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Re: [Digital BW] Re: QTR: hitch in the grayscale ramp for EEM_2200-cool?

Re: [Digital BW] Re: QTR: hitch in the grayscale ramp for EEM_2200-cool?

2003-10-16 by Ernst Dinkla

----- Original Message -----
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From: "David Wroblewski" <dawroblewski@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Wednesday, October 15, 2003 8:52 PM
Subject: [Digital BW] Re: QTR: hitch in the grayscale ramp for
EEM_2200-cool?


> The 0.661 -> 0.46 change totally eliminates the hitches I
> was seeing in the gray ramp.

David,

Would you like to try 0.45 as well and compare that with 0.46. It
looks like Robert Krawitz has settled on that number and he asked
me to inform you. The issue was mentioned by me in a completely
other thread on another list.

Ernst

[Digital BW] Re: QTR: hitch in the grayscale ramp for EEM_2200-cool?

2003-10-16 by ccolbertbw

I went through the same sort of adjustments for the SC 980.  I found that 
printing a smooth (1%) gradient with a single ink made it much easier to judge    
whether the dot size values were correct. This is because it is not transitions 
between inks that are the issue here, but instead the transition from one dot 
size to the next (within each ink). In other words a gradient with only one ink 
will show the "hitches" just the same.  After changing the dot  values, the 
single ink gradient looked smooth and then the full ink set fell right in line.

Costa Colbert

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Ernst Dinkla" <
E.Dinkla@c...> wrote:
Show quoted textHide quoted text
> 
> ----- Original Message ----- 
> From: "David Wroblewski" <dawroblewski@y...>
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Sent: Wednesday, October 15, 2003 8:52 PM
> Subject: [Digital BW] Re: QTR: hitch in the grayscale ramp for
> EEM_2200-cool?
> 
> 
> > The 0.661 -> 0.46 change totally eliminates the hitches I
> > was seeing in the gray ramp.
> 
> David,
> 
> Would you like to try 0.45 as well and compare that with 0.46. It
> looks like Robert Krawitz has settled on that number and he asked
> me to inform you. The issue was mentioned by me in a completely
> other thread on another list.
> 
> Ernst

[Digital BW] Re: QTR: hitch in the grayscale ramp for EEM_2200-cool?

2003-10-16 by David Wroblewski

Thanks Ernst. I did the experiment of printing out a 0.45 version
of the 21Step.tif stepwedge included in the QTR distribution.

There's an improvement, but it is extremely subtle, even held up to
a very bright light. The 0.45 ramp is just a _little_ smoother 
in the 50% and 80%-90% range. Thinking that might be natural 
variation from print to print, I printed it again and got the same 
result. All three stepwedges (0.46, 0.45 #1 and 0.45 #2) were
printed with the same sheet of paper, with the same carts.

So 0.45 wins for my setup. But wow it's subtle. 
-david

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Ernst Dinkla" 
<E.Dinkla@c...> wrote:
Show quoted textHide quoted text
> 
> ----- Original Message ----- 
> ...
>
> David,
> 
> Would you like to try 0.45 as well and compare that with 0.46. It
> looks like Robert Krawitz has settled on that number and he asked
> me to inform you. The issue was mentioned by me in a completely
> other thread on another list.
> 
> Ernst

[Digital BW] Re: QTR: hitch in the grayscale ramp for EEM_2200-cool?

2003-10-16 by Roy Harrington

This is probably within the variability of the printers, the measurements and
the dithering code.   I re-looked at the data and graphs where I came up
with 0.46 and 0.45 looks just as good (the two dotsize curves intersect in
slightly different locations).  It would be nice if the gimp-print guys had a
standard for measuring this because other printers are way off.

Roy

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "David Wroblewski" 
<dawroblewski@y...> wrote:
Show quoted textHide quoted text
> Thanks Ernst. I did the experiment of printing out a 0.45 version
> of the 21Step.tif stepwedge included in the QTR distribution.
> 
> There's an improvement, but it is extremely subtle, even held up to
> a very bright light. The 0.45 ramp is just a _little_ smoother 
> in the 50% and 80%-90% range. Thinking that might be natural 
> variation from print to print, I printed it again and got the same 
> result. All three stepwedges (0.46, 0.45 #1 and 0.45 #2) were
> printed with the same sheet of paper, with the same carts.
> 
> So 0.45 wins for my setup. But wow it's subtle. 
> -david
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Ernst Dinkla" 
> <E.Dinkla@c...> wrote:
> > 
> > ----- Original Message ----- 
> > ...
> >
> > David,
> > 
> > Would you like to try 0.45 as well and compare that with 0.46. It
> > looks like Robert Krawitz has settled on that number and he asked
> > me to inform you. The issue was mentioned by me in a completely
> > other thread on another list.
> > 
> > Ernst

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