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Using contour in postscripts produces a "stripe" effect? - solved [message #68543]

Wed, 04 November 2009 03:42

Andy Heaps
Messages: 22
Registered: March 2006

Junior Member

ITTVIS technical support have solved the problem with the faint white
lines in colour filled contour plots in postscript. This was described
in the 'Using contour in postscripts produces a "stripe" effect?'
article on 15th March.
http://groups.google.com/group/comp.lang.idl-pvwave/browse_t hread/thread/fd3c77e00dd840bd/d67af32fed916a02?lnk=gst&q =stripe+effect#d67af32fed916a02

A sample IDL colour filled contour postscript file and the PNG output from
convert -trim idl.ps idl.png
run on a Linux box are available at:
http://ncas-climate.nerc.ac.uk/ajh/white_lines/cylin3.ps
http://ncas-climate.nerc.ac.uk/ajh/white_lines/cylin3.png

The problem here is not with the postscript file but in the external
viewers use of anti-aliasing on the IDL postscript file to produce the
output figure. Turning off the anti-aliasing removes the faint white
lines on the external viewers as below.

Windows
gsview -> Media -> Display settings -> Text alpha -> 1 bit
Illustrator -> Edit -> Preferences -> General -> Anti-Aliased artwork

Linux, Solaris and Mac
convert +antialias idl.ps idl.png
convert +antialias idl.ps idl.pdf

Mac
Preview -> disable smooth text and graphics button

Cheers
Andy

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