Digital BW, The Print

That works to get the pattern out of the scan and the print, but you're 
still going to see it at certain sizes on a display.

-----Original Message----- 
From: Peter Marquis-Kyle
Sent: Thursday, March 27, 2014 1:45 AM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: Re: [Digital BW] Moire

On 26/03/2014 9:54 PM, Ernst Dinkla wrote:
> Scan at the highest resolution possible, print at the highest resolution
> possible (finest detail set) so upsampling is done on the data. Quite
> often downsampling without anti-aliasing applied makes things worse.  If
> the print may vary in size there is a good chance it will print with
> less moir� at another size. If the moir� started with the scan and shows
> in all sizes on the monitor it will appear in print too. Try to find an
> angle in the scanner that gives the least moir�. Make sure that the
> original is as flat as possible on the scanner. If the tools to take out
> raster screening moir� do not work add some noise or grain. Vary the
> image in size on the monitor, what is moir� at one size disappears or
> changes at another size, if that happens you have better chances in the
> print.

Ernst, that was good advice to scan at the highest resolution possible.
I have just made a print that is perfectly free of moir� pattern.

I re-scanned the original using 2400 samples/inch (instead of 600).
Because the original is larger than the scanner platten I made three
overlapping scans, which Photoshop automatically merged for me. It was a
straightforward process, but slow. I made a flattened greyscale tif and
printed it at 3121.472 pixels/inch -- I'm not sure whether it was QTR or
the printer that down-sampled this to the printer's native resolution,
but I don't care. The result is just what I wanted.

Thanks Ernst, I appreciate your advice!

--

Peter Marquis-Kyle


------------------------------------

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 \u201cGroup Topic, Rules and Guidelines\u201d 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 \u201cOWNER\u201d AND 
\u201cMODERATORS\u201d 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  \u201cOWNER\u201d AND 
\u201cMODERATORS\u201d 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





-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4354 / Virus Database: 3722/7253 - Release Date: 03/26/14