[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 16:42:07 UTC 2016


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


Ah, so it is the difference between the input document format content
resolution and the resolution the Printer or language interpreter should
use for the output. I can see how that might be useful for vector formats
because that might factor into the output speed or marking agent usage.

But for raster document formats, if you send a lower resolution, upscaling
cannot "create" information, so you would still end up with the source
resolution, right?  (I'll discuss this with our language interpreter /
color science people...)

Smith



> On 2016-07-13, at 3:02 PM, Michael Sweet <msweet at apple.com> wrote:
>
> 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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