I use libreoffice export images, command like: $ libreoffice --headless --convert-to png ./ /tmp/example.ppt
but this command only export one page, is first page image, how can export few image or specify page image?
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unoconv accepts the parameter
-e PageRange=1-2 for the PDF output filter. There may be a similar option for the png export filter, although it is not shown on the man page.
This should work instead: