Why doesn't 100% zoom in Adobe Reader draw things at the correct size?

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From: Chris Shearer Cooper
Date: Thu, 30 Sep 2010 15:23

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I have a very simple PDF file that changes the effective resolution
from 72 dpi to 96 dpi (and the origin from bottom-left to top-left)
and then draws a line 96 units long:

        q 0.750000 0 0 0.750000 0.000000 1456.500000 cm

        q 1.000000 -0.000000 -0.000000 1.000000 48.000000 -48.000000
cm
        0.0 0.0 1.0 RG 1 w 1 J 100 -125 m 196 -125 l S Q

        Q

The line is 96 units long, apply the transformation and it should be
72 units long in the default coordinate system, which would be exactly
1 inch.

But when I view this PDF in Adobe Reader 8 on my screen (Windows XP)
at 100% zoom, the resulting line is almost 1.25" long.

Wassup?

Thanks,
Chris

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From: Chris Shearer Cooper <chris.shearer.cooper@gmail.com>
Newsgroups: adobe.reader,comp.text.pdf,adobe.acrobat.windows
Subject: Why doesn't 100% zoom in Adobe Reader draw things at the correct size?
Date: Thu, 30 Sep 2010 08:23:11 -0700 (PDT)
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