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Re: [colorvision_group] ?faulty spectro

2008-03-20 by David Miller

On Mar 19, 2008, at 11:14 AM, Tim Mimpriss wrote:
> I have had some trouble with Spyder3Print on a new Mac Mini running
> Leopard. The OS could see the sensor, but not S3P. Support Europe
> suggested installing the latest version, but I already have 3.0.1 as
> indicated in my support ticket, and I can find nothing laterer.
>
>
It couldn't have been a software problem; maybe just a USB or power- 
over-USB
problem. What USB port do you have it connected to?
> Today it works! I measured a chart I had printed earlier only to find
> that the profiled image had unpleasant crossovers in the grayscale
> whereas the unprofiled image was fairly good on colour, but the
> grayscale ramp was off: a really big jump between 90K and 100K.
>
>
Sounds like bad measurements or other mistakes in the process to me.

Have a look at the first video in this set and see if that helps:

http://spyder.datacolor.com/learn_videos.php
> I then wondered whether the spectro could be faulty. After cleaning  
> the
> white pad and re-calibrating, I made some measurements off a Macbeth
> ColorChecker. Here are some results:
>
> Lab a b
> White 0.06 3.16
> Red 59 29
> Green -39 32
> Blue 15 -51
>
> All of these readings seem to be somewhat off target, but the blue
> especially so. Do I have a faulty spectro, or is there something I  
> have
> missed?
>
>

If you can email your measurement files to me at davem@...,
I can take a look at them and see what the problem is. Use the File:Open
Data command to open the folder containing the measurement files.

Best regards,


David Miller
Senior Software Developer, Digital Color Solutions
Datacolor

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