Digital BW, The Print

Can someone further elaborate on the choice of selecting Perceptive 
vs Relative in Create-ICC.

I would tend to believe that with Relative the Grey Scale would 
eventually not be evenly distributed since compression vs clipping 
would not occur, but there's confusion for me here...and a lot !

Thanks

Olivier


We
> want to manage luminance/density but leave the colour alone.  In 
other words
> we want to use colour management technology to manage the inevitable
> compression of luminance from a perfect scenario (the file) to an 
imperfect
> scenario of ink black and paper white.  But we'd also like full 
colour soft
> proofing and not just a soft proof of this luminance management.  
Roy's QTR
> Create ICC is used to write an ICC profile (not really to official 
specs)
> which only has luminance management in the outbound leg but full 
colour
> information in the inbound soft proofing leg.  In essence we get 
the best of
> both worlds.  We can use a more B&W oriented driver (eg Adv B&W) or 
RIP but
> still use colour management for luminance compression and soft 
proofing.
>