QTR-Quadtone RIP

There was some discussion on the BWPrinting list of possible deficiencies in
the dither algorithm used by Gimp Print (part of QTR). One suggestion was to
add some Gaussian noise to the shadows.

Tom Moore

> -----Original Message-----
> From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
> Behalf Of David Meddings
> Sent: Monday, October 31, 2005 5:30 AM
> To: QuadtoneRIP@yahoogroups.com
> Subject: [QuadtoneRIP] Banding with semi-gloss printing
> 
> I'm printing on EPSG with Daniel Staver's PKN-GLOP curves and getting
> very fine lines in shadow areas. I'm printing on an Epson 2100 with
> MIS UT inks (and using PKN obviously).
> 
> I believe the banding is present throughout the print but only
> visible in shadow areas. So the net effect is a very fine, almost
> scratch like pattern of horizontal lines that are parallel to the
> movement of the print head and appearing in the deep shadows.
> 
> Print head nozzle checks are consistently fine (although cannot check
> the Y obviously as it has GLOP). I've tried reducing the ink limit of
> the GLOP but this has no effect.
> 
> I've seen this now with two different images and am stumped. Does
> this ring any bells for anyone?
> 
> Printing tiff files processed out of Qimage and using 1440
> better/ordered in QTR. Not running absolutely latest version of the
> GUI - I think 2.2 f for QTR and 2.3.? for the GUI...
> 
> Best,
> 
> Dave Meddings
> 
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> Yahoo! Groups Links
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