[argyllcms] Re: Correct working of BTOA0 table
- From: "Gerhard Fürnkranz" <nospam456@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 28 Jan 2008 17:01:57 +0100
-------- Original-Nachricht --------
> Datum: Mon, 28 Jan 2008 11:11:23 +0100
> Von: John Weissberg <jw@xxxxxxxxxxxxxxxx>
> An: argyllcms@xxxxxxxxxxxxx
> Betreff: [argyllcms] Correct working of BTOA0 table
> I would like to ask about how they feel the BTOA0 table should correctly
> be used for driving ink-jet printers. In particular, do people think the
> Lab values referred to by the BtoA should be "absolute" or "relative".
According to the ICC specificaion, all tables recorded in the profile are
relative, i.e. they map "media white" to CIELAB [100,0,0] in the PCS. Absolute
intent needs to be computed by the CMM, which applies the profile, from the
relative tables. And for reflective prints, "media white" is typically the
color of unprinted paper.
I could image special cases though, where "media white" different from native
paper white may make sense. For instance, if one creates a proofing profile,
which emulates e.g. SWOP on an inkjet printer, then "media white" of such a
profile would rather refer to the emulated paper color, and not the native
inkjet one. But such "hacks" (albeit possibly useful) are beyond the scope of
the ICC specification.
-Gerhard
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