callas imposition engine
dfToolbox scales, fits, moves, extends, rotates, and flips pages and page content with ease. But it goes much further than that. The imposition engine in pdfToolbox is extremly powerful and can be used to impose incoming PDF files onto larger print sheets as required by the device. It is suitable for a large range of different real imposition tasks such as step-and-repeat, folded jobs using signatures, tiling, and cut-and-stack, as well as more specialized tasks.