[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 13:52:25 UTC 2014


Ira,

On May 23, 2014, at 11:21 AM, Ira McDonald <blueroofmusic at gmail.com> wrote:
> Hi Smith,
> 
> Actually, the Printer doesn't have to bind values to "xxx-actual" until the Job
> completes.
> 
> This reply is not about 'guaranteed'.
> 
> This reply is about the usability of 'attempted'.
> 
> An IPP Client could use Validate-Job with "document-format" and "pdl-override" and,
> when it receives the response that says ignored or substituted, examine the values 
> of "preferred-attributes" (from JPS3, PWG 5100.13-2012) to find out the extent to 
> which the Printer *could* and *could not* successfully 'attempt' to do the overrides.

Well, if a Client sends "ipp-attribute-fidelity" (not "pdl-override"), then Validate-Job needs to respond just like Create-Job/Print-Job/Print-URI.  So in that case "preferred-attributes" doesn't enter into the picture.

Instead, the Client would need to *omit* "ipp-attribute-fidelity" to see which overrides are supported.  Then you'll get the unsupported attributes/values and potentially the ones that would be used instead.

Based on my own experience, I'm not sure how useful/reliable this method would be, but we can certainly document it.

_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair

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