Re: Lightbox Measurement
Re: Lightbox Measurement
- Subject: Re: Lightbox Measurement
- From: email@hidden
- Date: Mon, 31 Aug 2009 10:22:48 +1000
Robin/Ken/Klaus,
I am picking up on a recent thread that I didn't have time to respond to...
I am not sure what the point of measuring an IT8.7/1 target on a light box is. I assume you are
creating a new characterisation data set for a profile of the transparency as viewed on a light box so
that you can compare it to the scan of the transparency as displayed on a monitor. If so, where does
the scanner profile fit in?
Mark Stegman
> From: Robin Myers <email@hidden>
> Subject: Re: Lightbox Measurement
>
> The monitor measurement fixture helps block ambient light from
> affecting the measurement. If you are measuring with the room lights
>
> on then it would be a good idea to leave the fixture attached for
> your
> transparency measurements. The alternative is to turn off the room
> lights and make sure there is no window or skylight illumination.
>
> The difficulty keeping the monitor fixture attached for the
> transparency measurements is that it makes positioning the
> spectrometer on the transparency more difficult. Measuring large area
>
> items such as filters would present no problem, but measuring an IT8
>
> transparency is much more difficult with the monitor fixture
> attached.
>
> Robin Myers
>
>
> On Aug 19, 2009, at 2:21 PM, Fleisher, Ken wrote:
>
> > Hello. I am using an i1Pro to measure transparency lightboxes. When
> I
> > measure my monitors I attach the i1Pro to the counter-weighted
> > cradle which
> > also has the feature of blocking stray light via the felt lined
> > edges. I am
> > wondering if I should be placing the i1Pro in this cradle for
> > measuring a
> > light box as well. How are others doing it?
> >
> > I do notice that a measurement in the cradle differs slightly from
> a
> > measurement without the cradle by about 20 cd/m^2. I assume that
> > using the
> > cradle is the correct thing to do, but wanted to ask how others are
>
> > doing
> > it. ItÂ’s kind of clunky with the weight attached (and a real pain
> to
> > take
> > the weight on-off as needed).
> >
> > Thanks!
> >
> > --
> > Ken Fleisher
>
> Message: 7
> Date: Wed, 19 Aug 2009 15:39:26 -0700
> From: Robin Myers <email@hidden>
> The item being measured here is a lightbox, not a monitor, so turning
>
> off the room lights is appropriate if the monitor adaptor is not
> being
> used.
>
> On your point of measuring monitors with or without the room lights
>
> on, I have always measured monitors (CRT and LCD) with the room
> lights
> off and never had any cast issues.
>
> One important point, if there are any other light sources on in the
>
> room that cannot be turned off (such as equipment power indicators or
>
> other monitors, etc.), I cover the item being measured with a black,
>
> light blocking cloth.
>
> Robin Myers
>
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