Digital BW, The Print

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

--- In DigitalBlackandWhiteThePrint@...m, "Olivier" <odesmais@...> 
wrote:
>
> Sorry if I was unclear. QTR is quite well documented, so one knows perceptual is to 
be used.
> 
> What I can't figure out due to limited understanding is WHY perceptual instead of 
relative is being implemented by Roy.
> 
> It's about pure personal understanding...
> 
> Thanks for the replies.
> 
> Olivier   
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "wwodets" <odets@> 
wrote:
> >
> > Olivier-
> > 
> > It wasn't clear to me if you were actually asking whether to use 
> > perceptual or relative with the Create ICC profiles letting PS manage 
> > color.  The answer is, use perceptual.  I have never found that this 
> > gives a very convincing soft proof (the weakness of the black is 
> > exaggerated in my soft proof setup), but it gives a very convincing 
> > print and one learns to use the soft proof.
> >
>