[IPP] Fwd: Value of "printer-resolution" | "printer-resolution-supported" vs. the "pwg-raster-resolution-supported"?

[IPP] Fwd: Value of "printer-resolution" | "printer-resolution-supported" vs. the "pwg-raster-resolution-supported"?

[IPP] Fwd: Value of "printer-resolution" | "printer-resolution-supported" vs. the "pwg-raster-resolution-supported"?

Ira McDonald blueroofmusic at gmail.com
Sun Jul 24 16:40:49 UTC 2016


---------- Forwarded message ----------
From: Michael Sweet <msweet at apple.com>
Date: Wed, Jul 13, 2016 at 5:02 PM
Subject: Re: Value of "printer-resolution" | "printer-resolution-supported"
vs. the "pwg-raster-resolution-supported"?
To: Smith Kennedy <smith.kennedy at hp.com>
Cc: Ira McDonald <blueroofmusic at gmail.com>


Smith,

> On Jul 13, 2016, at 4:00 PM, Kennedy, Smith (Wireless Architect) <
smith.kennedy at hp.com> wrote:
>
> Hi there,
>
> What again is the value of "printer-resolution" and
"printer-resolution-supported" vs. the document format specific attributes
that seem to specify the same information
("pwg-raster-resolution-supported", etc.)?  I know that
"printer-resolution" | "printer-resolution-supported" were defined in RFC
2911 but I'm trying to explain their value to some folks here and I'm at a
loss.

printer-resolution specifies the output resolution.  For example, a printer
that supports 4800x1200dpi can allow that resolution to be selected for
higher quality output.

pwg-raster-resolution-supported specifies supported document resolutions,
which are typically some integer divisor of the
printer-resolution-supported values.  For example, that same printer might
advertise 300dpi and 600dpi PWG Raster resolutions, which are upscaled to
4800x1200dpi (or whatever printer resolution is in use).

Having a lower document resolution allows for faster transfer (and less
processing on the printer overall) while still supporting high resolution
output.  And typically you are getting RGB or grayscale data that needs to
be converted to the device color space, dithered, etc.

_________________________________________________________
Michael Sweet, Senior Printing System Engineer
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