Digital BW, The Print

A bit of the image processing toolbox - just to load images. 

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Truman Prevatt 
<tprevatt@m...> wrote:
> Did you use the Image Processing Toolbox or just stright old Matlab?
> 
> Truman
> 
> nevnevsf wrote:
> 
> > -
> > >
> >
> > I programmed it in Matlab, and it isn't very user-friendly.
> >
> > I've been meaning to write up what I did, but haven't done it yet. 
The
> > algorythm is pretty straightforward, however. The main challenge 
in
> > creating an ICC profile for x-tone printing is dealing with the 
highly
> > non-one-to-one mapping between the tones the printer produces and 
the
> > RGB values sent to it - the same gray tone is produced by many
> > different RGB values. They key is to find the RGB values for each
> > lighness value that produces a gray which has minimal dot pattern. 
It
> > boils down to studying the pattern produced by the printer for 
each
> > RGB value sent to it, and choosing a trajectory in RGB space which 
has
> > minimal dot pattern. I tried to do it automatically, but it was 
easer
> > just to take 10 minutes and study the pattern manually. I then map
> > each point on that trajectory to a lighness value (the L* channel 
of
> > the L*a*b* space). This is done automatically by the program, 
after
> > scanning a few targets. The profile ignores the color (a*b*) 
channels.
> > For an variable mix inks, like Ultratone, I could use the color
> > channels to adjust the coolness and warmth of the inks. Alas, I've 
got
> > a whole bunch of FSN inks that I'm working through, so playing 
with
> > Ultratone inks isn't on my to-do list.
> >
> > Does anyone know whom should I contact about posting the FSN 1160
> > profiles?
> >
> >
> >
> >
> >
> > 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
> >
> >     * To visit your group on the web, go to:
> >       http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/
> >        
> >     * To unsubscribe from this group, send an email to:
> >       DigitalBlackandWhiteThePrint-unsubscribe@yahoogroups.com
> >       <mailto:
DigitalBlackandWhiteThePrint-unsubscribe@yahoogroups.com?
subject=Unsubscribe>
> >        
> >     * 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]