Re: Rel vs Abs proofs
Re: Rel vs Abs proofs
- Subject: Re: Rel vs Abs proofs
- From: Roger Breton <email@hidden>
- Date: Wed, 11 Oct 2006 21:18:24 -0400
Terry,
> I'll offer a counter argument and say that you may be on to something
> Roger.
OK. Me and my foggy intuitions ...
> In theory (and reality if you believe what ColorShopX is
> showing me), the gamut will expand by whatever amount the paper white
> happens to reduce the gamut
You would go as far as using the term gamut "expansion"?
> (I'm thinking of an increase in chroma at
> this point) in absolute rendering. When the paper white goes from,
> for example, L*90 to L*100 in relative, everything should get a bit
> lighter and more saturated/chroma.
Aha! That's my gut feeling exactly.
> ColorShopX is showing that to me
> if I switch between abscol and relcol.
Could you, possibly, for the sake of my understanding and those of other
readers of the List, briefly expand on the exact step you take in ColorShopX
to support your observations? That would be most appreciated, Terry.
> So in theory Roger, the relcol
> "proof" you get will not only have whiter whites but increased
> saturation in the solid primaries/secondaries as well.
Seems so obvious, probably, to a lot of folks, but I'm glad you're able to
corroborate this.
> The REALITY is, however, that much of this gamut expansion gets
> eliminated by the proofing media.
Oh?
> Whatever gains there were by
> "zeroing out" the press stock to white gets reduced back to the paper
> white of the proofing media.
That's an excellent point. Didn't occur to me that way.
> Assuming the proofing media is whiter
> than the paper white in the press profile, you'll still get SOME
> expansion
Right. There is a net positive expansion.
> but probably only about 1-2 L* worth depending on the
> difference between proof media and press paper white.
Ah! But it depends on the extent of the differential between the press paper
white and the proof paper white. Suppose a No5 SWOP press paper white of
89,0,4 and a proof paper white of 95,0,2. That's still quite a big
expansion, wouldn't you think? And say people still expect the press to hit
those 'expanded' colors regardless. More than 'relative colorimetric'
rendering : I call that 'irrational colorimetric' and quite frankly,
'distorted colorimetric' rendering. I know, I know, I may be going too far.
> Terry
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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