I'm working on some code to (amongst other tasks) help export an indesign document to a PDF suitable for CreateSpace submission. I've been looking around for the answers to my questions online, but find conflicting answers everywhere so thought I'd ask here for some experienced answers rather than trial and error from the CreateSpace submission process!
Although I'm working on JSX code and InDesign automation, my questions relate to normal operation of InDesign exporting.
When exporting, what is the preset I should be using for PDF/X exporting?
Should I be optimising the PDF to reduce filesize even if the size is relatively small? CreateSpace seem to flat out suggest that it the PDF should be optimised at all times
Should I avoid using semitransparent boxes over images as transparency doesn't appear to be valid?