Hi Acrobat wizards,
My work is digitizing old pamphlets for eventual publication on the web. Our scans (~80-200 pages per scan) need to be below 10000kb. We've found that running the "Enhance" Scanned Document (with Recognize Text) option generally shrinks them to a good size. We also recently found the "Edit PDF" section to be helpful, particularly because when we make the scan editable, we can easily delete the grainy backgrounds.
However, sometimes when we delete backgrounds, the file size gets much, much bigger (perhaps because of the creation of the editable page?), and sometimes it gets smaller (perhaps because the grey backgrounds are so many pixels?). More often it gets bigger. We've noticed these editable pages cannot be enhanced or shrunk in any way.
My question is, is there any way to edit a pdf page then revert the page back to a simple, uneditable image, while still keeping the changes?
If not, is there a way to enhance editable pages while keeping the same resolution?
If your editing is finished up and the document file size is getting bigger than you can do downsample or Resize PDF or print to Adobe PDF, it will helps you.
One thing I would try is to do a "File>Save As" after modifying the document. This will (different from a normal "File>Save") re-create the whole PDF document and throw out things that are not used. This may reduce the file size.
If you have Adobe Acrobat Pro, you can also see what type of information uses how much space in your file with the "Audit Space Usage" command. You will find this function by bringing up the "PDF Optimizer" (File>Save As Other>Optimized PDF), the button to audit the space usage will be in the upper right corner. If you do this before and after you edit your PDF file, you know what features in the PDF file are taking up the extra amount of space.