Reduce size of PDF files with embedded JPEG

I found this fantastic feature of ghostscript:

gswin64c -sDEVICE=pdfwrite -dNOPAUSE -dBATCH -dPDFSETTINGS=/ebook -sOutputFile=C:newFile.pdf C:originalFile.pdf

Sources:
http://www.itechies.net/blog/archives/1764
http://www.alfredklomp.com/programming/shrinkpdf/