Digital BW, The Print

On Feb 11, 2009, at 5:15 AM, nadar1900 wrote:

> I have used the spectrocolorimeter datacolor #1005 of my PrintFixPro
> package for 2 years, profiling about 40 different papers for color and
> grayscale with good results. But, just in the last days, measurements
> of dark patches seem quite strange on the color coordinates in Lab
> values. For example, here 5 Lab measurements of the step 96 in a 51
> steps grayscale, waiting about 5-10 second between them:
> 1) 7,99 | -2,91 | 1,26
> 2) 8,25 | -1,29 | -0,9
> 3) 8,11 | -0,85 | -1,1
> 4) 8,29 | -0,22 | -2,13
> 5) 8,00 | -1,47 | 1,28
>
> B value range from 1,28 to -2,13 and I can notice an evident loss of
> contiguity, for a and b values for dark patches, comparing same paper
> profiles created in the last days and one month ago.
> I have repeated the same tests with different sw upgrades, from
> PrintFix 1.0 to Spyder3Print, on different computers and different usb
> ports, but nothing to do.
> Have you any suggestions?

Since this appears to be a hardware based issue, if the variance is  
beyond what your usage allows for, you will have to purchase another  
unit, since your current one is beyond warranty. Sorry!

C. David Tobie
Global Product Technology Manager
Digital Imaging & Home Theater
CDTobie@...


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Datacolor
www.datacolor.com/Spyder3




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