Line width in inported graphics slightly diminishing in FM generated PDFs

[Dov Isaacs]

... Or you could change the preflight rules to allow a certain
amount of tolerance. Allow 0.19 point as the lower limit
instead of 0.20 point for linewidth.
 

> -----Original Message-----
> From: frameusers.com On Behalf Of Steve Rickaby
> Sent: Wednesday, March 08, 2006 3:34 AM
> To: framers at FrameUsers.com
> Subject: Re: Line width in inported graphics slightly 
> diminishing in FM generated PDFs
> 
> At 09:52 +0900 8/3/06, Yosuke Ichikawa wrote:
> 
> >We're using Acrobat's preflight feature to check for lines thinner
than
> >0.2 pts. The thinnest lines in our .eps graphics are exactly 0.2 pts,

> >but when we import these graphics in FM and check the PDFs created
from 
> >FM, Acrobat preflight says the graphics uses "0.199600pt" lines.
> >
> >PDFs of these individual graphics, created from Illustrator, do not 
> >have problems with Acrobat prefight, so it seems to be some sort of
FM 
> >conversion problem.
> >
> >Why does this happen, and is there any way to prevent this on the FM 
> >side? If there is no way to fix this, we'd have to tell our
illustrator 
> >to make the lines in the graphics slightly thicker.
> 
> This looks a lot like a rounding error problem due to two 
> different applications using different precision math. In 
> floating-point math, computers use a set number of bits to 
> represent the complete range of natural numbers. As a result, 
> some numbers actually cannot be represented precisely: the 
> more bits you use, the closer you get, but there's always a 
> compromise.
> 
> I guess you have two approaches:
> 
> . Ignore the preflighting and print anyway
> 
> . Make the lines a little thicker
> --
> Steve
>