Digital BW, The Print

> 
> ... the ICC requires white point scaling in
> XYZ for media relativity and Adobe does their black point compensation by
> scaling in XYZ. 

Perhaps the "problem" is that XYZ and Lab L have different luminance
distributions.  The X-Rite "Color Guide" I have gives some very brief
explanations of these spaces.  With respect to XYZ, it notes, "The basic CIE
color space is CIE XYZ.  It is based on the visual capabilities of a
'Standard Observer,' ..."  On the other hand, in describing L*a*b* it notes
the "unbalanced nature of the XYZ space ..."  "As a result, the CIE
developed more uniform color scales called 'CIE L*a8b*' and "CIE L*u*v*.'"

Now, I think color was the context of the descriptions -- it is called
"color management" after all -- but I wonder if the same issues affect the
nature of the grayscale distributions.


> In some respects one might say "don't fight it Marsha -
> it's bigger than both of us!".  

True, but it might be worth trying to find the best of both worlds.

I note that my 2400 with the Advanced B&W, printing on EEM with tone set to
"Normal" produces a wonderful ramp with densities that are very close to the
standards that I have been using for a long time -- based on the Lab scale
and what the old Piezo B&W system used.  So, perhaps some at Epson also
think the standard color management assumptions are not optimal for B&W.

Paul
www.PaulRoark.com 




 
> > From: Paul Roark <paul.roark@...>
> 
> >
> > It is about the same as what the monitor does, if not "corrected" 
> > with a custom dot gain curve.  However, looking at if from the 
> > perspective of what makes the best print, we are wasting 
> > precious grayscale.  If in 8 bit, our
> > 256 steps is reduced to about 218 effective steps.  
> > I'm not sure that is a wise compromise at all.
> >
> > Paul
> > www.PaulRoark.com
> 
> 
> 
> 
> 
> Please visit the Group Homepage to check the Files, and other resources as
> they are often being updated.
> 
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
> 
> If you wish to receive no emails or just a daily digest, or you wish to
> unsubscribe, please edit your Membership preferences by visiting this same
> page.
> 
> Please follow these basic guidelines:
> - As threads develop, trim off excess portions of earlier messages to keep
> them short.
> - Good manners are required at all time. No personal attacks or flames.
> Hostile, aggressive or argumentative users may be removed from the
> membership without notice.
> - Keep your posts and threads related to the group topic of digital B&W
> printing. Users who persistently make off-topic posts may be removed from
> the membership.
> - By posting on this forum you agree to abide by the group rules and
> guidelines, and to abide by the actions and decisions of the group Owner
> and Moderators. See Group Topic, Rules and Guidelines in the Files
> section:
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/
> 
> BY PARTICIPATING IN AND/OR POSTING MESSAGES TO THE DIGITAL BW, THE PRINT
> YAHOO! GROUP YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE OWNER AND
> MODERATORS OF DIGITAL BW, THE PRINT YAHOO GROUP SHALL NOT BE LIABLE TO
> YOU FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR
> EXEMPLARY DAMAGES, INCLUDING BUT NOT LIMITED TO, DAMAGES FOR LOSS OF
> PROFITS, GOODWILL, USE, DATA OR OTHER INTANGIBLE LOSSES (EVEN IF THE
> OWNER AND MODERATORS OF DIGITAL BW, THE PRINT YAHOO GROUP HAVE BEEN
> ADVISED OF THE POSSIBILITY OF SUCH DAMAGES), RESULTING FROM: (i) THE USE
> OR THE INABILITY TO USE THE DIGITAL BW, THE PRINT YAHOO GROUP; (ii)
> UNAUTHORIZED ACCESS TO OR ALTERATION OF YOUR TRANSMISSIONS OR DATA; (iii)
> STATEMENTS OR CONDUCT OF ANY THIRD PARTY ON THE DIGITAL BW, THE PRINT
> YAHOO GROUP; OR (iv) ANY OTHER MATTER RELATING TO THE DIGITAL BW, THE
> PRINT YAHOO GROUP.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
>