PDF to JPEG with Higher Resolution

I have a simple script that takes a FileMaker layout, exports it as a PDF and uses AppleScript and Image Events to convert that PDF to a JPEG. It works, but the resolution of the JPEG is much lower than that of the original PDF. Here's the code that does the conversion:
tell application "Image Events"
launch
set fileRef to open tempFile
save fileRef as JPEG in destFilePath
close destFilePath
end tell
The final JPEG has a resolution of 72dpi. I've looked through the Image Events dictionary and there is a read only property of resolution. Would it be better to use another application or perhaps some sort of command line utility to get this job done without the resolution loss?
Thanks,
Chuck

OK, I read some of the man page for sips, and found the -g option for getting a property. I ran the following commands:
sips -g dpiHeight 00127.pdf
sips -g dipHeight 00127.jpg
Both report that the dpi is 150.000. However, when I open both files in Preview and place them side by side, and magnify the image three times using Cmd-+, I see pixilations of the JPEG file but not the PDF image. This is what lead me to believe that I was losing resolution. I can zoom in quite far with the PDF (10 times or so) and see details. With the JPEG I lose the detail after very few zooms.
So, perhaps it's not losing resolution, but something else is happening?
Thanks,
Chuck

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