Re: 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 16:17

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On Sep 30, 9:59 am, bugbear <bugbear@trim_papermule.co.uk_trim> wrote:
> 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

New PDF code:

        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 580 -125 l S Q
        Q

That line is 480 units long, times 0.75 is 360 units at 72 dpi = 5.00"

On-screen at 100% it's showing up as almost 6 1/8" long, at 72 dpi
that's about 441 units long.

Chris

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From: Chris Shearer Cooper <chris.shearer.cooper@gmail.com>
Newsgroups: adobe.reader,comp.text.pdf,adobe.acrobat.windows
Subject: Re: Why doesn't 100% zoom in Adobe Reader draw things at the correct size?
Date: Thu, 30 Sep 2010 09:17:08 -0700 (PDT)
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