In suggesting an alternative to using embedded Visio files and
living with frequent crashes, strewth at rcn.com suggested:
> You can also just save the Visio files as jpegs and import by reference. 
> Works for me.

Yes, you can use some standard graphic file format for intermediate
files, but JPEG is the worst choice. For starters, it is a raster image 
format, which means you lose the vector characteristics of the 
underlying drawing. (WMF/EMF, PDF, and EPS would preserve the 
vector nature.) But besides that, JPEG is singularly unsuited for
line art or drawings that include text because of the nature of its 
lossy image compression. If you look closely at line art saved in
JPEG, you will see a kind of gray smudginess next to lines and 
surrounding text like a little cloud. This is an artifact caused by 
the JPEG image compression algorithm, which was optimized for 
*photographic* images, which are statistically *very* different 
from line art and which tend to mask these kinds of artifacts. 
JPEG is the only file format that inherently produces artifacts on 
line art.

-Fred Ridder

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