Datacolor User to User Support Group.

--- In colorvision_group@yahoogroups.com, MGochnauer <goch@...> wrote:

> 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 ;-)