There must be some misunderstanding here. You have a PS_MEDIA setting so it looks like you are trying to impose a paper size on a figure. You would only use PS_MEDIA if making a PostScript plot and you wish to use a whole sheet of paper for some reason. All other schemes will automatically give a tight bounding box. When you print to a printer, you will get whatever paper size you have in the printer, but that is no reason why we would make a PDF with lots of white space… If you have that particular and unusual need, then make a PostScript file and run psconvert manually to give you a “page PDF”.