On Thu, Jun 23, 2022 at 6:42 AM Patrick O'Callaghan pocallaghan@gmail.com wrote:
On Thu, 2022-06-23 at 13:02 +0930, Tim via users wrote:
On Wed, 2022-06-22 at 14:01 -0300, George N. White III wrote:
AirPrint was introduced in 2011 to support iPads. https://openprinting.github.io/driverless/01-standards-and-their-pdls/ summarizes the differences in the various Driverless Printing implementations. PDF is supported across the board, but there are several raster formats and also PDFm which is viewable with PDF viewers, but tailored for the capabilities of specific printer models.
I have a HP printer in that boat. It proudly proclaims direct PDF printing (send it a PDF file, or plug a USB into the front with a PDF on it). But after a lot of digging around you find that it only supports a special PDF created by their driver program, no other PDF files are supported.
So Non-Portable Document Format ...
PDFm is supposed to work with PDF viewers. I assume it just adds printer-specific metadata: things like which paper tray, duplex (double-sided) long or short edge binding, collating, stapling, etc.