[poppler] pdftoppm: resulting image dpi and/or size is unexpected

[Albert Astals Cid]

El Dilluns, 7 de maig de 2012, a les 16:58:27, Carlos Fernandez va escriure:
> trying to split a pdf into page images using pdftoppm.  I would like
> the resulting images to maintain the same size and scale as the source
> PDF.  unfortunately the images being generated are somewhat
> unexpected.
> 
> using "-r 150" (or just relying on the default value of 150) to create
> an image on a 8.5x11 inch pdf generates an image that is 1275 × 1651
> pixels at 150dpi.
> 
> using "-r 240" to create an image on the same 8.5x11 inch pdf
> generates an image that is 2040 x 2640 pixels at 239.97 dpi.

Hmmm, really?
2040/8.5 = 240 not 239.97
2640/11 = 240 not 239.97

> 
> these results were consistent for png or tiff output.  I got similar
> results for other dpi settings across a few different PDFs.
> 
> What can i do to get more consistent results?

What's inconsistent?

Albert

> 
> Carlos
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