Digital BW, The Print

Only the OutCurve is used since both directions only have one input channel.
You can have 3 sets of curves for the different intents but the "0" curve will
be used for all if the others don't exist.   The softproof is based on the A2B0
curve and although potentially there could be 3 different soft-proof curves
there's no way to select which one is used for the reverse direction, nor can
you select BPC on/off for the reverse.  So you must decide where the black is
mapped before making the profile.

Roy


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale <stevekale@b...> 
wrote:
>
> BTW I think the below may be fine for the PCS to Device (B2A0) tag since we
> are just applying a simple transfer function to a single channel,ie to
> luminance only, and BPC can be built into this transform.  I wonder, though,
> if it creates complications on the soft proof leg, Device to PCS (A2B0),
> because it will be this tag (I assume) that PS coordinates with most for
> soft proofing. 
> 
> 
> > From: Steve Kale <stevekale@b...>
> 
> > In addition, Roy seems to only use the
> > Out Curve part of the A2B0/B2A0 tags which would make sense as an easier
> > application because we are just applying transfer curves.  I have never seen
> > a colour profile use this portion of the tag.
>