title: Pdf to Pdf of Image with PdfBox
body: <p>I'm using pdfbox (1.8) to handle pdf on Windows (7 and above). I need to take an input pdf and convert to a pdf made by the same page but used as image (no text selectable etc etc). With small file i have no problem but when i have to convert bigger file i have no clue due to massive memory use.
  I will post some code if it helps but the approach i'm using is simple: create a document by all the page saved as image taken from the source pdf.
  I'm searching for some more memory and time efficent way to do this (i have to handle pdf with 1 or 2 k of pages).</p>