What are your current PDF settings?
http://www.google.ie/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&ved=0CEEQFjAC&url=http%3A%2F %2Fwww.adobe.com%2Fdesigncenter-archive%2Facrobat%2Farticles%2Facr6optimize%2Facr6optimize .pdf&ei=dmskUuPnN6Sp7QbkuIDIBw&usg=AFQjCNGzj9qDVqFl6ujX5k7O7EOKEvd_5A&sig2=0DH3rFg3cKZTxtn Lrp-WEg&bvm=bv.51495398,d.ZGU
I generate 1000 of files a day, so opening up Acrobat each time and running a batch is not an option. Is there any way to get Acrobat to running automatically (e.g. through a watch folder perhpas?)
My current seetings are high quality print. But I make the following modifications:
1) I set comptability to Acrobat 8/9
2) I set the resolution for colour images to 150 ppi for images 150ppi and above.
3) I set the image compresion to JPEG and the image quality to Maxmium (changing this to below maxmium causes the print quality to become fuzzy).
I was looking for command-line PDF conversion tools and eventually found out this:
To me, it is way too pricey (US$ 570), but maybe it's a viable solution to you. It has watched folder workflows, therefore it can be handy for your purposes. You can download a demo and even test it online (the resulting PDF is watermarked).
I submitted a file to their online testing page and were impressed with the results: a 1.5 Mb original PDF resulted in a 925 Kb file (while an Acrobat "optimized" file ot the same sample PDF turned out to be _bigger_ then the original). What makes it even more impressive: in the online test I deselected ALL the image downsampling settings, to force the optimized PDF to keep the original image quality and resolution. Then, in Acrobat, I exported the images from both the original PDF and the optimized one, and compare them in Photoshop. They were not identical, but the difference is pratically imperceptible. I guess that applying downsampling to the test will result in even smaller PDFs, but I didn't test this.
Anyway... I don't have any affiliation with those guys, and I don't have either the need nor the money to buy this product. I'm only sharing these thoughts because they may point you to other ways to find a solution. The above mentioned application seems to be very efficient. If you can afford it, then I think it deserves a try. If not, you can search the Web for plugins or other tools that can fit you needs and budget. Acrobat/InDesign approaches are not the only way to go.