Subject: IPP> RE: MOD - Printer resolutions

From: "McIntyre2,Lloyd" <[email-masked]>
Date: Fri, 11 Jul 1997 09:41:20 PDT

Carl,
Allow me to make some comments to your note below
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From: Carl-Uno Manros
To: [email-masked]
Cc: Cancio,Vivian; McIntyre2,Lloyd
Subject: MOD - Printer resolutions
Date: Friday, July 11, 1997 10:57AM

One of my home work assignments from Nashua was to try to find out about
the resolutions used by fax machines.

The simple answer in DPI is:

res-100     (no mm equivalent)
>this resolution will be approved in Oct 97 to be used in color 
 transmissions only
res-200x100 (note that x-resolution is higher than y-resolution)
res-200
res-300     (no mm equivalent)
res-400

However, this is only part of the truth. Most fax machines, as well as some
printers, are natively based on lines/mm rather than DPI, which means that
we also need to be able to express values in lines/mm if we want to be exact.

Hence, we also need the following fax resolution values expressed in lines/mm:
>not that the lines/mm resolutions are not square

res-7.7x3.85
>this should be 8x3.85
res-7.7
>this should be 8x7.7
res-8x15.4   (no inch equivalent)
res-15.4
>this should be 16x15.4

There are two possible ways of doing this, either by adding this in the
attribute value for resolution, or by adding a separate attribute for the
native measuring system of the fax/printer.

In the first case we would end up with values like:

res-200x100-inch

and

res-7.7x3.85-mm
>this should be 8x3.85-mm

In the second case we would skip the last part of the resolution value and
instead have a new attribute called "printer-resolution-base" with the two
values:  "metric" and "inch".

I suggest to use the second solution, which seems more extensible for the
future and which would allow a client to quickly find out what the base is
without having to read a potentially long list of resolution values.
>the second solution is also consistent with the solution used in fax

I would also encourage people in the WG that are working with metric based
printers to come up with a list of the metric values that we would need to
add for printers.

Comments?  Omissions?

Carl-Uno

Carl-Uno Manros
Principal Engineer - Advanced Printing Standards - Xerox Corporation
701 S. Aviation Blvd., El Segundo, CA, M/S: ESAE-231
Phone +1-310-333 8273, Fax +1-310-333 5514
Email: [email-masked]