Thank you for your effort, but fde101 is right - this will NOT produce a 1 Bit Bitmap.
No offense, but maybe not all understand what's the benefit of this file format really is in (offset)printing.
Just in very short words:
If you send a PDF to the imagesetter (by now a CTP-machine for almost 100%), your data will be seperated and rasterized.
CMYK and Grayscale will be rasterized in around 300 dpi max for each channel.
The CTP machine will impose with a max resolution of 1200-2400 dpi.
So Vectors and Text (which is a sort of vector) will be imposed at max imagesetter resolution (at least 1200 dpi). Images and rasterized text, Forms etc get 300 dpi.
This causes the sharp look of Text / vectors compared to e.g. Text produced in Photoshop etc.
If you send a 1200dpi Bitmap picture of lineart to the CTP Machine, it will be imposed as sharp as text or vectors....
That's it.
And you need this format, since vector tracing will never achieve the same detailed result. There are always errors.