Convert long pages of pdf

[pilgrim2go]

Hi,

Thanks again for your sharing ( http://mikelynchgames.com/software-development/using-wand-to-extract-pngs-from-pdfs/)

I'm able to convert a 28-pages pdf to 28 images. The ugly thing is the image quality is not so good ( and I can't extract text from image).
Do you have any tips to improve the quality of image ( per page)?
Something like convert 2 images per page? increase resolution?
I tried to use SingleImage but failed for now.

Thanks again.

[nycynik]

The original quality of the PDF matters, but it's using the raster images for the PDF rendering. Can you share the PDF?