Here is the way to convert PDF file to PNG files (1 PNG for 1 page of the PDF) with convert
command, according to [1].
Maybe output image file type are recognized automatically from the file extension name ".png".
$ convert \ -verbose \ -density 150 \ -trim \ input.pdf \ -quality 100 \ -sharpen 0x1.0 \ output.png
Then output-0.png
, output-1.png
, output-2.png
, and etc are created.