In addition to this you have chosen to create a PDF/A file. There are disadvantages to this approach (it does limit us in preserving some non-printing aspects of the input file), but there are also advantages for instance it permits us to alter colour spaces, flatten transparency, change font encodings etc. So the output PDF file has nothing in common with the input PDF file, except its appearance. In the case of pdfwrite, it re-assembles these primtives into a brand new PDF file. In the case of a rendering device (eg TIFF) it renders theoperation to a bitmap and when it reaches the end of file, it writes the bitmap as a file. The device then emits them to the output file. This then processes these primitives, and passes them to the device. What happens is that the PDF interpreter interprets the PDF file, and produces a series of graphcs primitives, which it feeds to the graphics library.
Let me start with my standard lecture on this subject when you take a PDF file as input, and use Ghostscript's pdfwrite device to produce a new PDF file, you are NOT 'converting', 'editing' or 'modifying' the input file. You haven't supplied an input file to look at, nor mentioned which version of Ghostscript you are using.
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