Reduce+PDF+Image+Size

code gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf code

change /screen with one of the following to create different quality images (prepress is the best and screen is the lowest)

/prepress /printer /ebook /screen