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Re: [colorvision_group] ?faulty spectro

2008-03-20 by Tim Mimpriss

David,

Thank you. See below

David Miller wrote:
> 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?

Tried both port on computer and powered hub.

>> 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

Have done so. the most useful learning point is to use Measured rather 
than Split on the measurement screen.

>> 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.

Will do.

> 
> Best regards,
> 
> 
> David Miller
> Senior Software Developer, Digital Color Solutions
> Datacolor
> 
>

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