Re: Spectrophotometer measurements
Re: Spectrophotometer measurements
- Subject: Re: Spectrophotometer measurements
- From: Pete Carter <email@hidden>
- Date: Mon, 08 Jul 2002 23:42:42 +0100
>
At 7:44 PM +0100 7/8/02, Bob Frost wrote:
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> Terry,
>
>
>
> Colorsavvy (who make my Colormouse) say specifically that targets should be
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> measured using a black background (to prevent transmitted light coming back
>
> through the target and upsetting the reflected measurements).
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>
>
> I read Bruce Fraser's suggestion of using identical sheets of paper behind
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> the target, so that it more resembles the situation when you are looking at
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> a printed image in a magazine or book that has identical sheets behind it. I
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> tried it and it does change the measurements considerably. I don't have
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> enough experience yet to say whether the change is for better or worse.
>
>
>
> When I thought of taking the 'middle road' and stacking up identical
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> targets, CD Tobie said that was not a good idea.
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>
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> Since most of my prints are mounted on grey backing board, I also suggested
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> that reading the targets on grey backing board might be the best solution
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> for me, but the experts never rose to that one!
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>
>
> Bob Frost.
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>
>
If your images are likewise to be displayed on grey backing board,
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it's probably a perfectly reasonable solution.
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>
The problem with stacking targets is that you wind up exaggerating
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the black, and your saturated colors come out darker than they should.
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>
A bigger problem is what to do when your targets have something else
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printed on the reverse. I'm open to suggestions on that one!
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>
Bruce
Bruce,
Don't print your targets on paper that have print on the other side would be
my suggestion!!!
Seriously ive measured targets with light and dark backings and the worse
results were when using newspaper or light stock, measuring the lighter
colours with a black background. I now use a greyish neutral card and its
about average. You could always generate several profiles relative to their
backings, or is this getting too obsessive?
Pete
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