Hi Tom! :-)

 TW> pdf appears to use Vector Grapgics and they magnified quite a bit 
 TW> before loosing any resolution at all.
PDF can use both vector graphics and bitmaps. The vector stuff should scale
to any magnification, the bitmap stuff obviously behaves like a bitmap, so
scaling those too much doesn't look good (unless the document itself used
the bitmap scaled down, in which case you'll even have to magnify it to see
all details).

Ciao
Pascal

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