Re: arbitrary profiling targets
Re: arbitrary profiling targets
- Subject: Re: arbitrary profiling targets
- From: "Roberto Michelena" <email@hidden>
- Date: Sun, 21 May 2006 12:34:38 -0500
Mike Strickler wrote:
It would be a very strange device that required 69000 samples
to make a good profile. And by the way, has anyone who is
concerned about this worried about the mere 30-50 patches
used by their RIP for linearization?
The number of samples is related exponentially to the number of inks.
Using 69,000 patches on a 12-ink printer is roughly equivalent to using
41 patches on a 4-ink printer. 69,000^(1/12)=41^(1/4). Not a lot, eh?
Of course when we consider Lc being a subset of C and so on, we're
only talking about a 7-ink printer. Which as Graeme has pointed out
somewhere, does not take full advantage of the potential gamut, since
interesting results come from mixes such as Red and Light Cyan.
If considered as a 7-ink printer, then 69,000 patches are roughly
equivalent to using 582 patches on a CMYK one. Still not a lot.
Now that's only the mathematical equivalence. Considering many
combinations produce black or near-black, and eliminating the
redundancy of RGB with CMY, probably those 69,000 (if well designed)
are equivalent to using 6,000 patches or so... (no math behind this
number, unfortunately).
-- Roberto Michelena
Infinitek
Lima, Peru
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