Re: Zooming in on Fabrics
Re: Zooming in on Fabrics
- Subject: Re: Zooming in on Fabrics
- From: "Wolf Faust" <email@hidden>
- Date: Thu, 15 Mar 2001 14:11:16 +0100
- Priority: normal
On 6 Mar 2001, at 22:14, colorsync-users-request@lists wrote:
>
While a target with a strong color cast may indeed indicate a problem, I
>
would say this is not _necessarily_ so. The important thing is that the
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measurements found in the reference file accurately represent the actual
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colors of your target. If this is true, then even if the grayscale has a
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slight color cast, the profiling software should still be able to make a
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good profile because the reference file measurements will also show this
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same cast.
Correct, but this is really just a minor problem. You really need a target made
out of the material used during scan. And additionaly there are problems with
getting the correct measurements for the reference file. As said here before,
light conditions are very important for surfaces found at fabrics. And of
course different conditions between spectrometer and scanner can be a
major cause of faults. So even with your own custom target, you still will get
faults. But making your own target based on the used fabrics is surely a good
step.
>
How do you know if your reference file contains accurate measurements of
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_your_ target? Make your own reference file (some profiling packages allow
>
you to do this).
Sorry, but any decent quality IT 8.7 target manufacturer will specify typical
batch faults of his target. At least for the latest targets I offer (Kodak claims
similar low values) the typical reproduction fault is arround dE 0.5.
Considering the typical faults of spectrometers to be several times higher, the
main source for faults is the used spectrometer and not the manufacturer
batch averaging of the targets. Simply measuring the target using X-Rite or
Gretag spectrometers will most likely increase the fault compared to using the
well decently tested manufacturer file. I would only recommend making own
measurements if the source of the targets is not known or the target is getting
old (usualy >1-2 years).
--
Wolf Faust Tel: +49-69-5486556
mailto:email@hidden Fax: +49-69-95409598
http://www.coloraid.de Mobile: +49-179-6924769