Digital BW, The Print

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