Re: epson 2200 > blackpoint compensation
Re: epson 2200 > blackpoint compensation
- Subject: Re: epson 2200 > blackpoint compensation
- From: Roger Breton <email@hidden>
- Date: Wed, 17 Dec 2003 09:01:40 -0500
>
> How would knowledge of the source gamut influence this conversion
>
> differently?
>
>
By establishing the extremes that are to mapped. Of course this is
>
no great trick, nor is BPC. The point is that BPC is a very simple
>
version of what correct gamut mapping does. Given the full knowledge
>
of the source and destination gamuts, construct a mapping from one
>
to the other, that achieves the best possible result, guided by
>
the chosen intent.
>
>
Graeme Gill.
Excuse me for insisting but when you write "By establishing the extremes
that are to mapped", to me this is exactly what I was refering to when I
wrote "map SourceRGB White to DestinationCMYK White and SourceRGB Black to
DestinationCMYK Black" -- regardless of BPC (or does this definition take
into account BPC ?). I understand that the algorithmic implementation of
this mapping could be a lot more convoluted than one might think intuitively
(e.g. 6 parameters for the gray axis in Argyll) but the main variables still
remain the *extremes* that are mapped, from Source to Destination, no?
I understand you mean what you mean but I still don't get how a deeper
knowledge of the source would make a better mapping to a destination in the
ICC system? Right now, I see the fundamental building block of the ICC
system as being 'modularity', each device is independent of the other and
does not have nor does not need to know anything about where the color came
from or where it is going to guarantee a reasonable match between Source and
Destination. [Please correct me if I am wrong.] While I've heard many people
over the years mentioned in passing that this de-coupling was not ideal and
knowledge of the source would benefit the conversion, I've never found any
specific examples or discussions as to what kind of knowledge is refered to
and how is this knowledge to influence differently the outcome, here or
elsewhere on the net or in print. Thereby my insistence.
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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