PDF images?

[steve harley]

they whom i call Ashley Aitken wrote:
> Yes, sure, I guess I was asking how to get the embedded image (if 
> possible) out of the PDF rather than "resampling"  (is that better?) 
> into another image format (considering PDF is vector mostly - not that 
> there is anything else in the PDF besides the image and blank space).

PDF is not really "vector mostly"; raster and vector components 
are both first class components; several compression formats are 
  supported for images, and there is even a "PDF Image Only" 
format commonly used for scanned images

to extract the images, if neither Photoshop nor Acrobat Pro is 
available, try the demo of File Juicer (there are probably other 
options, my first thought was pdftk, but no go)

<http://echoone.com/filejuicer/>

saving to JPEG from Preview is probably not ideal; best i can 
tell, Preview always renders saved images at 150 ppi; if the 
PDF's image data is at a higher (or lower) density, that would 
indeed comprise resampling, and if the image was stored in the 
PDF with lossy compression, you will compound the loss when 
recompressing with JPEG (though Preview offers lossless output 
formats)