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hi guys I found different behavior on windows, when use single quote it will raise error and should be use double quotes for parameters
gs -dNOPAUSE -sDEVICE='jpeg' -dJPEGQ=85 -sOutputFile=test.jpg -dGraphicsAlphaBits=4 -r300 -q pdf.pdf -c quit
Unknown device: 'jpeg'
gs -dNOPAUSE -sDEVICE="jpeg" -dJPEGQ=85 -sOutputFile=test.jpg -dGraphicsAlphaBits=4 -r300 -q pdf.pdf -c quit
worked well