Digital BW, The Print

I recently made a new profile for the 2400, UT-3D inkset, and Crane SR
paper.  I was curious how the ColorVision spectro and my older X-Rite DTP22
compared with respect to their Lab A & B measurements.  The graph (if it
gets through the Yahoo filter) and numbers below show the results for 5
points (dmax, 75%, 50%, 25%, and paper white).  "CV" is for ColorVision; XR
for X-Rite.  In a different comparison, an Eye-one was about like one of the
meters for Lab A and about like the other for Lab B.  I suspect this type of
accuracy is all we can expect from these price points, unfortunately.

 

 

 

 

 

L          CV-A    CV-B    XR-A     XR-B

3.94      -0.42     -1         -0.46     -1.1

25.39    0.7        0.8        -0.02     1.24

51.64    0.98      1.17      -0.01     1.76

73.76    1.14      1.16      0.08      1.97

96.22    0.82      0.72      -0.24     1.94

 

Paul

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

 



[Non-text portions of this message have been removed]

Wow! Those #s are very instructive. If generaly true of all the
similar instruments, it would seem that one needs to keep a calibrated
it8 around to monitor the instrument and then accept results as being
relative. (Shades of going back to the scanner methods)

Regards
Duane





--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark"
<paul.roark@...> wrote:
>
> I recently made a new profile for the 2400, UT-3D inkset, and Crane SR
> paper.  I was curious how the ColorVision spectro and my older
X-Rite DTP22
> compared with respect to their Lab A & B measurements.  The graph (if it
> gets through the Yahoo filter) and numbers below show the results for 5
> points (dmax, 75%, 50%, 25%, and paper white).  "CV" is for
ColorVision; XR
> for X-Rite.  In a different comparison, an Eye-one was about like
one of the
> meters for Lab A and about like the other for Lab B.  I suspect this
type of

> accuracy is all we can expect from these price points, unfortunately.
> 
>  
> 
>  
> 
>  
> 
>  
> 
>  
> 
> L          CV-A    CV-B    XR-A     XR-B
> 
> 3.94      -0.42     -1         -0.46     -1.1
> 
> 25.39    0.7        0.8        -0.02     1.24
> 
> 51.64    0.98      1.17      -0.01     1.76
> 
> 73.76    1.14      1.16      0.08      1.97
> 
> 96.22    0.82      0.72      -0.24     1.94
> 
>  
> 
> Paul
> 
> www.PaulRoark.com <http://www.paulroark.com/>  
> 
>  
> 
> 
> 
> [Non-text portions of this message have been removed]
>

I have the PrintFix Pro.  Moving the sensor on the various patches and 
taking a reading often gives significantly different results. Hence the 
best way to make a profile would be to take a good number of readings 
and average them, which is a real pain, as measuring the 720 (or so) 
steps takes 20 to 30 minutes.  The software says that it can average 
profiles, but I can't get mine to work.