Fwd: Re: FWA / OBA compensation, user expectations
Fwd: Re: FWA / OBA compensation, user expectations
- Subject: Fwd: Re: FWA / OBA compensation, user expectations
- From: Jan-Peter Homann <email@hidden>
- Date: Mon, 18 Apr 2011 16:21:32 +0200
Hello Tom and all:
Most tools I have seen, are using the terms FWA / OBA compensation or
-correction in a workflow, where (mostly M0) spectral data is converted
to D50 L*a*b* values with an internal applied fomula for compensation or
correction of FWA / OBA
The results could e.g. be, that the spectral data of the paperwhite is
normaly converted to e.g. L* 95 a*1 b*-8. The conversion with
compensation will lead e.g. to L* 95 a*0 b*-3
So far a s I know, there are no ISO or CIE recommendations for a formula
to calculate OBA/FWA compensation -correction form (M0) spectral data.
So every vendor uses his own model / formula.
The open source tool ArgyllCMS uses a model / formula which has been
published as white paper . The ArgyllCMS documentation has a special
chapter about FWA / OBA compensation / -correction:
http://www.argyllcms.com/doc/FWA.html
Best regards
Jan-Peter
Am 18.04.11 13:26, schrieb Tom Lianza:
I am a little confused by your use of the word "compensation" in point 3.
What does this mean?
On 4/18/11 7:09 AM, "Jan-Peter Homann"<email@hidden> wrote:
3) OBA / FWA compensation independent from profile generation
***************************************************************
I think, it makes a lot of sense, when the FWA / OBA compensation can be
applied to the measurement-data, before the ICC-profile is calculated.
This allows e.g. to extract target values for process control in
hardcopy-proofing and softproofing from the compensated measurement-data.
4) Avialable tools for FWA / OBA compensation
***********************************************
Following tools are e.g. avaliable for FWA / OBA compensation from
spectral measurement-data:
- Heidelberg Color Tool (commercial)
- Argyll CMS (open source)
- XRite i1 isis with OBC (commercial)
(If other tools are avaliable, please feel free to notice us, in this
e-mail)
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