[IPP] Potential errata/update for PWG Raster Format and/or IPP Everywhere specs

[IPP] Potential errata/update for PWG Raster Format and/or IPP Everywhere specs

[IPP] Potential errata/update for PWG Raster Format and/or IPP Everywhere specs

Michael Sweet msweet at apple.com
Mon Jun 2 16:05:58 UTC 2014


Ira,

On Jun 2, 2014, at 11:45 AM, Ira McDonald <blueroofmusic at gmail.com> wrote:
> Hi Mike,
> 
> Right - Of course there is no job template attribute for "pdl-override".
> 
> There is an "overrides (1setOf collection)" attribute with the specific
> job processing instructions to use for forced override.

The "overrides" attribute specifies the per-page/document override intent.

"ipp-attribute-fidelity" and "job-mandatory-attributes" are the attributes used to force the overrides (or whatever other intent is present in the Job Ticket).

> So my idea is that Validate-Job should tell you *which* of the "overrides" 
> values will be honored (with "ipp-attribute-fidelity" of 'true').  Why isn't
> this useful?


First, you'd just get a binary result (OK or not supported) that in the case of pdl-override-supported='attempted' you might not be able to trust because the Printer may not be able to tell you whether the override can be honored until the document is processed.

Second, if a Printer actually supports the OPTIONAL "overrides" attribute for a given document format, I strongly suspect that "pdl-override-supported" will be 'guaranteed' for that format since 'attempted' would be rather weak for per-page/document overrides.

In any case, I think our focus should be on common cases where the Client might want to override basic PDL instructions: copies, media/media-col, print-color-mode, sides, etc.  I don't think we should waste cycles on improving things that were only added in IPP/1.0 to address the concerns of products that could not/cannot provide PDL override support for legacy document formats like PCL and PostScript.  There are hundreds of millions of operating IPP printers that will never be upgraded - we should document and acknowledge that, tell Clients to generate modern PDLs whenever possible and to match the output to the job ticket, and tell new Printers to support PDL override for those modern PDLs to enable consistent output.

_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pwg.org/pipermail/ipp/attachments/20140602/2717dce7/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 4881 bytes
Desc: not available
URL: <http://www.pwg.org/pipermail/ipp/attachments/20140602/2717dce7/attachment.p7s>


More information about the ipp mailing list