On Thu 12 Aug 2021 at 18:56:58 -0400, Polyna-Maude Racicot-Summerside wrote:
> Hi, > > On 2021-08-12 6:27 p.m., Brian wrote: > > On Thu 12 Aug 2021 at 15:33:26 -0400, Polyna-Maude Racicot-Summerside wrote: > > > >> Hi, > >> > >> On 2021-08-12 3:22 p.m., Brian wrote: > >>> On Tue 10 Aug 2021 at 18:29:02 -0400, Polyna-Maude Racicot-Summerside > >>> wrote: > >>> > >>> [...] > >>> > >>>> I'm using a Xerox B205 MFC and it's fully supported. Yes it's laser but > >>>> the reason I am writing this message regard something else. > >>>> > >>>> It's the support of MOPRIA. > >>>> Even if it's mostly made for Android, what it does is offer a discovery > >>>> and printing protocol compatible with all CUPS system (will publish IP > >>>> endpoint that support PostScript, PCL and PDF, all depending on the > >>>> printer but at least one of them). Regarding the scanner, it will > >>>> support sending by email thru the use of a SMTP server account. > >>>> > >>>> So I think we can say these devices will be supported by Linux (and > >>>> Debian). > >>> > >>> I was a bit taken aback when you advocated Mopria as a criterion for > >>> determining whether a printer could be operated driverlessly on Debian. > >>> But is it the *best* criterion? > >>> > >>> I've now got my head around it. > >>> > >>> Surely, it is better looking for AirPrint support in the printer specs > >>> to determine the driverless capabilities of printer? > >>> > >> > >> Have you looked what does Mopria is ? > > > > I have examined the aims and objectives of the Mopria Alliance in > > excrutiating detail. > > > >> It require that the printer (and scanner) offer : > >> Printing thru the use of IPP protocol > > > > Correct. > > > >> Possibility to send the data in PDF format directly (or JPG) > >> Auto discovery of the services offered thru "Bonjour". > > > > Please give a link at the Mopria website substantiating your clain that > > a Mopria certified device should be ca[able of accepting PDF as a PDL > > in addition to PWG raster and PCLm. > > > Like already written in my first post regarding this issue : > https://mopria.org/spec-download That is a link to an HP scanning specification. Maybe I was less than clear that printing and printers were the focus of my attention, not scanning. > >> And all of the condition make a printer pretty much driver less. > >> > >> There's no link with you talking about AirPrint. > > > > That avoids any meaningful dialog (and is incorrect). > > Can you explain to me what does AirPrint has to do with driverless > printing ? Can you explain to me if AirPrint allow my printer automatic > discovery ? IPP ? JPEG/PDF direct printing ? There are three criteria for a printer to be regarded as driverless. 1. The transport protocol must be IPP. Apple AirPrint uses it. 2. There must be a discovery protocol, mDNS/DNS-SD. Apple AirPrint uses it and calls it Bonjour. 3. There must be a PDL common to the client and the printer. It is the third criterion in relation to Mopria that I am concerned with. As you said above: > ...(will publish IP endpoint that support PostScript, > PCL and PDF,... Leaving aside that PostScript and PCL are not acceptable driverless PDLs, I was intrigued by the information that PDF is a common PDL satisfying criterion 3 for a Mopria-certified printer. I read https://mopria.org/PDFs/Mopria_Whitepaper_092313.pdf which is from 2013. It says: > Page Description Languages WiFi Direct Services Print includes > PCL-m, PWG Raster > Standard Document Exchange Format JPEG, .png, PDF (future) I then hoped (forlornly, it turns out) that you might know the present status of PDF as a printing PDL in Mopria eight years afterwards. If you do not know, thats fine. We will leave it there. -- Brian.
