<< The question is, of course, how can a 38 mb container hold all the data in a 527 mb container? Does InDesign use some compression technique that Scribus does not? If so, why not? After all, an almost 14:1 compression ratio is significant! >> Might need to know more about what the "pre-press folks" exactly did. If you could post the pdf's somewhere, maybe able to interrogate them a little to see. Depending on the version and method used to construct PDF yes there can be use of compression, and if we are talking about text then there could be significant differences in size. Graphics also have a big bearing, what sort of graphics are embedded and how are they handled? K.
