Digital BW, The Print

Peter - is the print something you can shoot or scan again, or do you not have access to the original?

If you can re-do it, try shooting it from a greater distance and/or at a rotation of 15-45 degrees from level.  If you don't have a RAW file and access to software like Phocus or something similar that has an option to treat moire, I doubt that you will have much luck trying to improve the file.

Good luck - 
Stephen Petegorsky

On 26/03/2014 8:15 PM, Stephen Petegorsky wrote:
> Peter - is the print something you can shoot or scan again, or do you not have access to the original?
>
> If you can re-do it, try shooting it from a greater distance and/or at a rotation of 15-45 degrees from level.  If you don't have a RAW file and access to software like Phocus or something similar that has an option to treat moire, I doubt that you will have much luck trying to improve the file.

Thanks Stephen. Yes, I do have the original, and I am working with a 
flatbed scan. I don't think rotating the original will help, since the 
engraved lines run in various directions. There is no dot screen here, 
only hand-engraved lines on end-grain boxwood. Did you look at the image 
on the web page I linked to? -- you can enlarge it to see the engraved 
lines.

--

Peter Marquis-Kyle

On 26-03-14 11:45, Peter Marquis-Kyle wrote:
> On 26/03/2014 8:15 PM, Stephen Petegorsky wrote:
>> Peter - is the print something you can shoot or scan again, or do you not have access to the original?
>>
>> If you can re-do it, try shooting it from a greater distance and/or at a rotation of 15-45 degrees from level.  If you don't have a RAW file and access to software like Phocus or something similar that has an option to treat moire, I doubt that you will have much luck trying to improve the file.
>
> Thanks Stephen. Yes, I do have the original, and I am working with a
> flatbed scan. I don't think rotating the original will help, since the
> engraved lines run in various directions. There is no dot screen here,
> only hand-engraved lines on end-grain boxwood. Did you look at the image
> on the web page I linked to? -- you can enlarge it to see the engraved
> lines.
>
> --
>
> Peter Marquis-Kyle
>

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\ufffd at another size. If the moir\ufffd 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\ufffd. Make sure that the 
original is as flat as possible on the scanner. If the tools to take out 
raster screening moir\ufffd do not work add some noise or grain. Vary the 
image in size on the monitor, what is moir\ufffd at one size disappears or 
changes at another size, if that happens you have better chances in the 
print.


-- 
Met vriendelijke groet, Ernst

http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
January 2014, 600+ inkjet media white spectral plots.

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\ufffd at another size. If the moir\ufffd 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\ufffd. Make sure that the
> original is as flat as possible on the scanner. If the tools to take out
> raster screening moir\ufffd do not work add some noise or grain. Vary the
> image in size on the monitor, what is moir\ufffd 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\ufffd 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

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


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