I'm not sure how to select a specific page from a pdf, but this is what I use to convert single-page pdfs to jpgs: 
convert -colorspace rgb input.pdf -antialias -quality 60 output.jpg

[download]
You really MUST use -antialias, and if you're converting CYMK pdfs to jpgs for the web, you really should also use the -colorspace rgb option, since many browsers suck at CYMK jpgs.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^3: pdf thumbnail? by Joost
in thread pdf thumbnail? by leocharre

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