[IPP] Re: PWG Raster comtinue

[IPP] Re: PWG Raster comtinue

[IPP] Re: PWG Raster comtinue

Michael Sweet msweet at apple.com
Wed May 18 03:40:55 UTC 2011

[Realized I hadn't responded to this one...]

On Apr 26, 2011, at 4:05 PM, Petrie, Glen wrote:
> Mike,
> We still seem to differ on the adding page number and flip/orientation.   I hope we agree on adding the driver data fields to the PWG Raster.
> An unusual request:  I would like to understand better the need for flip/orientation in a raster.    Since I do not know who or what company may have requested the flip/orientation data, would it be possible for you to send an email to the individuals who requested the flip/orientation asking if they can state why they need the data and why they are not expecting the raster to be in the correct flip/orientation that the printer would need to print the specified print job.

Glen, *I* added this because support for flip/rotate for duplex printing has been in CUPS for about 12 years now. I have used it for CUPS Raster drivers for that length of time in order to support shipping printers (back then a bunch of HP DeskJet printers) that didn't have enough memory to cache two sides of raster data and "do the right thing".

The printer tells the client what to do for the back side images of duplex raster jobs, and the proposed additions to the page header allow the client to tell the printer what it generated. The printer can ignore it, error out (if the values are wrong), or fix it (again, if the values are wrong) as desired.

Michael Sweet, Senior Printing System Engineer, PWG Chair

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