Digital BW, The Print

MIS has posted a little tutorial for modifying curves that Dirk Hobman wrote
(I edited and supplied some files and forms).  It's in the MIS "What's new"
tab at:
http://www.inksupply.com/index.cfm?source=html/whatsnew.html

It might be useful to you.

Paul
http://www.PaulRoark.com
____________________________________



-----Original Message-----
From: gendem [mailto:gendem@...]
Sent: Monday, November 03, 2003 10:57 AM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: [Digital BW] Re: Quadtone Variable Mix and the Photo 900


>Mike,
>There is nothing wrong with what you are doing but
you >might find it
>more revealing if you print one of the many step
wedges >available.
>
>Jerome
>http://www.jeromehawkins.com/


Right you are, I should have thought of that.

I'm a noob in the dark with this stuff, trying to
retrofit curves from one printer to another.  So far I
have only applied the neutral curves to the test
patterns.  I combined "21-Step+.jpg", "100 step 1 line
greyscale strip.jpg", "100-step wedge, 8bit,
Grayscale.jpg", "OffsetGrad8.jpg" into one file and
used that for the testing.

What I have found is that the 1270 curves, both mac
and pc, produce a pronounced stepped gradiant, with
steps at 90% and 65%.  The 1270 curves also are much
flatter between 65-75% and 40-60%.

The 1280 curves seem to be much better at spreading
the range around, although a much less pronounced step
is visible at 65% and 90%.  The 1280 pc curve does not
go pure white (that is, no ink) at 0%, while the
1280mac curve does.

Interesting stuff.  It takes a fine eye and lots of
ink to get these right I imagine ;)  I'll try the warm
curves next, since those ones produces the most
trouble in the output.

Thanks for the help and pointers ;)



__________________________________
Do you Yahoo!?
Yahoo! SiteBuilder - Free, easy-to-use web site design software
http://sitebuilder.yahoo.com


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 http://docs.yahoo.com/info/terms/