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Re: [Swftools-common] possible rounding issue when using "-s zoom="


From: Ben Broadhurst
Subject: Re: [Swftools-common] possible rounding issue when using "-s zoom="
Date: Thu, 04 Mar 2010 10:29:45 +0000
User-agent: Thunderbird 2.0.0.23 (Windows/20090812)

In case anyone else has this odd problem, adding 0.001 and rounding to 3 decimal places seems to fix it.

Cheers all,
ben.


Chris Pugh wrote:
Did you perchance try,

   pdf2swf -p 1 -s zoom=54.43365479 -s jpegquality=90 -S -z
page_01.pdf -o page_01.swf

   pdf2swf -p 1 -s zoom=54.4336548 -s jpegquality=90 -S -z page_01.pdf
-o page_01.swf

   pdf2swf -p 1 -s zoom=54.433655 -s jpegquality=90 -S -z page_01.pdf
-o page_01.swf

   pdf2swf -p 1 -s zoom=54.43366 -s jpegquality=90 -S -z page_01.pdf
-o page_01.swf

   pdf2swf -p 1 -s zoom=54.4337 -s jpegquality=90 -S -z page_01.pdf -o
page_01.swf

   pdf2swf -p 1 -s zoom=54.434 -s jpegquality=90 -S -z page_01.pdf -o
page_01.swf

??

Just maybe using .43365478 is rather overdoing the accuracy?  Remember
that the more decimal places one adds, the smaller, theoretically, the
number gets.

Regards,


Chris.


On 3 March 2010 14:00, Ben Broadhurst
<address@hidden> wrote:
Hi all,
I am having a minor issue with swfs being sized incorrectly. An example pdf is 
here:
http://ps1.sk.im/7/8/78826/PDFs/page_01.pdf

PDF size info:
width/height: 595.22x842 points (209.98x297.04 mm)

Our system converts pdfs to 450px wide, so I calculate the "-s zoom=" param 
with the formulae (450/widthInPoints)*72, this gives me a dpi of 54.43365478

So pdf2swf get run like this:
pdf2swf -p 1 -s zoom=54.43365478 -s jpegquality=90 -S -z PDFs/page_01.pdf -o 
hiRes/page_01.swf

This generates an sdf that is 449 pixels wide. Not a huge difference I know, 
but it gives us headaches down the line. This happens in about 7% of PDFs that 
I convert, and when it does happen it's always 449 - never 451 which is why I 
thought it may be a rounding issue.

In case it helps, I get the size info out using pdf2text (www.pdftron.com) 
using the command line:
pdf2text --pages 1 --pageinfo PDFs/page_01.pdf

which spits out:
595.22, 842, 0, 0, 595.22, 842, 0, 0, 595.22, 842, 180

which is page    width     height     mw     mh     pw     ph    cropLeft     
cropBottom     nw     nh     rotation

These dimensions match what I get from Acrobat as well.

Sorry for the long email - I have been trying to fix this for what feels like 
my entire natural life.

Cheers all,
ben.












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