Digital BW, The Print

Thanks Roy...this makes sense assuming one can get the curve right so that
it is consistent across images.  I don¹t know anything about the guts of QTR
or Gimp etc and I am a novice to the technology behind these things but
stepping back and thinking about this for a moment there must be a way to
extract a proof space from QTR and it¹s curves (rather than by visual
guestimate).  Presumably, and in very laymen terms, QTR maps shades of gray
in the document colour space (eg Gray Gamma 2.2) to a printer/media space.
The doc space can be measured ­ QTR must read values for input ­ and so can
the output space (aren¹t these measured to calculate the ³curves²?).
Presumably a colour space profile can be constructed from the input/output
equation.....much in the same way that we construct ICC profiles in colour
work?  Am I smoking the proverbial here?

Steve


From: "Roy Harrington" <roy@...>
Reply-To: DigitalBlackandWhiteThePrint@...m
Date: Wed, 12 Nov 2003 20:45:13 -0000
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: [Digital BW] Re: QTR printing lighter than on screen...

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Steve Kale"
<stevekale@b...> 
wrote:
> I recently calibrated my monitor and Epson 2100 with Gretag Macbeth's Eye-One
> Photo system.  When I use QTR with Carl's curves my prints are about 1/2 a
stop or so 
> lighter than on screen.  Is this just the difference in printer production
tolerances (ie I 
> should really construct my own QTR curves for my own printer as I have done
for 
> colour work) or something else?  I am assuming that in a well calibrated
> environment I should be getting exactly what I see on screen.  Is the QTR/B&W
world 
> the same as colour in this regard?
> 
> Cheers
> 
> Steve

Steve,

I've also experienced the same thing.  I don't know the reason -- I'd
also think if everything is calibrated it all ought to match.  Fortunately
its quite easy to create a Proof Setup so you can compare the screen
and the print.  Tyler Boley has a nice write up for doing this in the Files
section of this group.  Check out:

Image Processing>Matching Your Monitor view to Your Prints.pdf

This is well worth the effort.

Roy




Yahoo! Groups Sponsor
 
 ADVERTISEMENT
 <http://rd.yahoo.com/SIG=12csj2364/M=267637.4116732.5333197.1261774/D=egrou
pweb/S=1705019182:HM/EXP=1068756325/A=1853618/R=0/*http://www.netflix.com/De
fault?mqso=60178338&partid=4116732>

Please visit the Group Homepage to check the Files, Bookmarks, Polls and
other resources as they are often being updated. The page is at:

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:
- Include your full name with your message.
- Include the address of your website, if you have one.
- As threads develop, trim off excess portions of earlier messages to keep
them short.
- As the topic of a thread changes remember to change the subject header.
- Good manners are required at all time. No personal attacks or flames
- Complete your Yahoo profile.
- Before posting a question, search the message archives and the various
resources on the homepage.




Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
<http://docs.yahoo.com/info/terms/> .



[Non-text portions of this message have been removed]