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The linux package imagmagick is required for this command
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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if you leave out -page A4 it will use the size of the jpeg as the size of the page;
Or if you happen to use US Letter sized paper; juse replace A4 with letter to get the standard 8.5x11in size us Yanks know and love... sort of.