Table rules randomly dark in pdfs

[Chen, Loretta]

Thanks everyone for the information. 
 
I don't see why a "bad" machine would produce a bad on-screen line that
is then visible on a good machine. But I'll make some final checks on
the uniformity of our printer driver and call it a day.
 
While frustrating, it does takes the heat off me for not being able to
figure out what's going on. 
 
So thanks for the info!
 
L.
 
________________________________

From: Fred Ridder [mailto:docudoc at hotmail.com] 
Sent: Friday, November 30, 2007 8:51 AM
To: Doug; Chen, Loretta
Cc: framers at lists.frameusers.com
Subject: RE: Table rules randomly dark in pdfs


Doug wrote:

> In my experience the true test is whether the rules print
> normally...Acrobat has a reputation for not being able to draw lines
> well. If the hardcopy is fine, just ignore the inconsistent ruling.
 
Just to clarify: Acrobat's problems with line widths is on-screen 
only, and it all has to do with how Acrobat handles fractional 
pixel widths. If a line in a document happens to straddle the 
boundary between two pixels in the screen image, Acrobat may 
draw *both* pixels as black even though the proper line width
is 1 pixel or less. If you increase the zoom factor so that most 
lines are more than 1 or 2 screen pixels in width to begin with, 
the difference of an extra pixel on some lines becomes a lot less 
noticeable. 
 
But regardless of the on-screen display anomaly, Acrobat always 
produces line widths in printed output that are accurate within
the printer resolution (e.g. 1/600 inch).  
 
 


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