A very handy feature of ImageMagick's convert command is that it can convert PDF's to other image formats like jpg but did you know you can even manually select a range or specific pages from the PDF?
Here is an example of converting a range of pages from a PDF in this case pages 25 to 36:
convert -density 300 "vSphere 6.5-1.pdf[25-36]" vsphere.jpg
Here is an example of converting a list of specific pages from a PDF in this case pages 45,54,69:
convert -density 300 "vSphere 6.5-1.pdf[45,54,69]" vsphere.jpg
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