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Re: [Swftools-common] [PATCH] resolution based output scaling for swfren

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Subject: Re: [Swftools-common] [PATCH] resolution based output scaling for swfrender
Date: Mon, 6 Aug 2012 02:19:51 +0200

On Mon, 6 Aug 2012 11:47:18 +1200 (NZST)
Tim Whittington <address@hidden> wrote:

> swfrender currently scales output 1:1 from the source .swf. 
> Assuming that the source swf file is produced by pdf2swf, the swf
> size is actually translated from the original paper size at 1 pt == 1
> px, and so the overall PDF -> PNG rendering is done at 72dpi. 
> I need to render the output images at higher DPI (e.g. for computer
> display I'd like 100-150dpi), so I've added a -r option that scales
> the output image based on a ratio of the target resolution to 72dpi
> (e.g. 100DPI == 1.388 scale). 
> This is slightly weird given that SWF and PNG both have pixel sizes,
> so it only make sense if you assume a pdf2swf generation of the SWF,
> so I'm not 100% sure this fits with the purpose of swfrender
> (although it does seem to assume a pdf2swf generate input). 
> cheers 
> tim 

Maybe it should be borne in mind, that screen independent units are
Twips, not dpi, which are basically printing units ( and therefore
inherently misleading).  Screens are almost universally rated using
dot pitch ( dot trio pitch ).

SWF uses twips internally, and Flash player for positioning items on
the Stage.


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