Digital BW, The Print

Hi Roy,

Thanks for the reply and sorry for the double-posting in QTR group.
Naively I was thinking that perceptual was providing the ability to 
compress L* (Y) "uniformely" thus preserving general contrast. While 
relative would not re-scale the same (except vis a vis white media)
and provide only a somehow flat BW print. Apparantly the ICC building 
process makes it irrelevant to dig further.

As for softproofing, I'd guess it makes sense to remain coherent and 
adopt perceptual, BPC, no ink black simul.

As it sounds above, I'm pretty new to this...


Olivier


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Roy Harrington" 
<roy@...> wrote:
>
> 
> Hi Olivier,
> 
> I don't have a particularly special answer.  The first ICC profiles 
I made were
> based on single-channel transfer functions so there was one one 
curve.   The
> current ones have the capability of 3 intents (Perceptual, 
Relative, Saturation)
> but exactly the same curve is put into all 3 intents.   For the 
printing side of the
> profile as far as I can figure you will always get the same 
result.  Soft-proofing
> however involves lots of profile conversions and although the QTR 
curves are
> all the same how you setup your soft-proof (intent, bpc, ink black) 
give several
> different black conversions.
> 
> For grayscale I haven't found anything definitive about differences 
in the 3 intents.
> 
> Roy
>