Digital BW, The Print

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]