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I add the -r to specify dpi resolution, and the papersize maintains the a4 proportions, otherwise I think it'll default to letter (8" by 11"). The dBATCH and dNOPAUSE are useful for doing batches of postscripts, so that gs doesn't wait for you to hit enter. This could be used in a script as follows:
for image in ./images/*; do
gs -sDEVICE=jpeg -r300 -sPAPERSIZE=a4 -dBATCH -dNOPAUSE \
edit: matthewg42, is there any advantage of specifying the - in gs and redirecting the postscript file using <, rather than just specifying it as an argument in the gs command?
edit: Matthew, is there any advantage of specifying the - in gs and redirecting the postscript file using <, rather than just specifying it as an argument in the gs command?
It just prevents "showpage, press <return> to continue" messages after each page, and stops the GS> prompt from appearing after the file is processed. It is just another way to accomplish what the -dBATCH -dNOPAUSE options do.