On Mon 13 Mar 2023 at 04:25:12 +0800, Jeremy Ardley wrote: > > On 13/3/23 03:38, Stefan Monnier wrote: > > > > Nowadays PDF is what matters: it's the standard format for driverless > > printing (along with a mix of JPEG, PWG raster, or PCLm depending on > > which driverless printing standard you're talking about). Admittedly, > > standards like IPP Everywhere require support only for the PWG raster > > and JPEG format, while the PDF format is relegated to "should be > > supported", but PDF is so pervasive and so easy&cheap to support on > > current hardware that it doesn't make much sense not to support it, > > except maybe for printers that focus on things like printing photos. > > [ Note: this is just a guess, I have no actual data to back it up :-) ] > > > I have written one printer driver in the cups system for a thermal printer. > > The processing chain in cups generated a raster bitmap image for me to > format and deliver to the printer. I didn't dig deep but I suspect the > previous stages involved postscript before raster conversion rather than > directly from a pdf stage.
Suspicions don't quite cut it when writing a filter. -- Brian.