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

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From: bugbear
Date: Thu, 30 Sep 2010 15:59

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Chris Shearer Cooper wrote:
> 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?

Use a longer line. to get better test data.

The most obvious thing thats wrong is that you have dot-pitch set
wrong "somewhere".

I have *NO IDEA* where dot pitch is configured on XP,
or even if it *is* configured.

   BugBear

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