Datacolor User to User Support Group.

Thanks.  Your procedure and conclusions make perfectly good sense...  
but when I am trying out a completely new system that I must learn  
from the bottom up, I like to minimize the variables.  And in the  
beginning I'm not even sure what the variable *are*, so I don't trust  
my judgment!

Myron

On Mar 14, 2006, at 9:56 AM, Tom wrote:

> --- In colorvision_group@yahoogroups.com, MGochnauer <goch@...> wrote:
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>> How sensitive is the reader to ambient light falling on the target?
>> The instructions say nothing, one way or the other.
>
> Here's are some simple tests.  Lift your 1005 off the paper and point
> it tword the middle of your room.  Take a reading.  Unless you have a
> brightly lit room it almost always reads black or very close to it (at
> least mine does).  Second take a reading and then deliberately try to
> shine your light along the side of the paper under the nose.  Now no
> cheating and lifting it off the paper!  That would cause the
> illumination from the LEDs to decrease and isn't realistic ... though
> the light show is kind of cool.  Mine doesn't change.
>
> Consider that the shroud on the colorimeter does a pretty good job of
> shading the paper, that the LEDs are fairly bright, and any ambient
> illumination on the target is at approximately 90 degrees from the
> surface of the paper.
>
> You could probably calculate the contribution due to ambient light but
> odds are its below the noise level.
>
> The ColorVision folks could of course give you a much more technical
> answer ;-)
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