I'm looking for a way in Ubuntu to reduce the size of a pdf (by reducing the quality of the images).
I know that this can be done in Ghostscript by typing the following command in terminal:
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf
The problem is that I can't specify the quality with any accuracy. The parameter
-dPDFSETTINGS=/screen is the one that decides the quality; but the alternatives are quite rigid (for example it is possible to do
-dPDFSETTINGS=/ebook for slightly better quality).
I'm looking for a way to reduce the size of a pdf in a way that allows me to specify the desired quality numerically.