Harry,
There are exactly 254 mm in an inch, so the precision is about the same, the
inches are about 4 times more precise than the metric units.
For example, the two most popular Self Describing Size Names are:
The letter size (8.5 inches by 11 inches) used in North America:
na-letter.8500-11000
The iso A4 size (210 mm by 297 mm) used in metric countries:
iso-a4.2100-2970
Note that they both have about the same number of digits in each dimension,
namely around 4.
Also there isn't any need to convert from inches to mm or vice versa,
because the paper size is given ONLY in the natural units for the usage. So
North American sizes only use 1000ths of inches and aren't converted to mm.
Similarly, the non-English sizes are always given in 10ths of mm and aren't
converted to inches. Therefore, there is never any rounding errors to worry
about.
The only rounding that could occur, is if some paper size is actually in
some fraction of inches, or mm, such as 200 1/3 mm or 10 1/3 inches. But I
don't think we have any sizes like that.
Ok?
Tom
-----Original Message-----
From: Harry Lewis [mailto:harryl at us.ibm.com]
Sent: Monday, April 16, 2001 15:33
To: RonBergman at aol.com
Cc: ipp at pwg.org
Subject: IPP> Media Standardized Names - Units
I'm questioning the use of 1/1000 for English but only 1/10 for metric.
Not only are we loosing precision, but, also introducing rounding errors
during conversion from English to metric . I know the printer MIB heritage
is 1/1000 English and 1/10 metric... but
I think we should try to be more precise in this new media mapping.
----------------------------------------------
Harry Lewis
IBM Printing Systems
----------------------------------------------
RonBergman at aol.com
Sent by: owner-ipp at pwg.org
04/09/2001 02:26 PM
To: <ipp at pwg.org>, <upd at pwg.org>
cc:
Subject: IPP> Fwd: FW: Media Standardized Names, Version D0.6
is now available
----- Message from "Bergman, Ron" <Ron.Bergman at Hitachi-hkis.com> on Mon, 9
Apr 2001 08:02:14 -0700 -----
To:
"'RonBergman at aol.com'" <RonBergman at aol.com>
Subject:
FW: Media Standardized Names, Version D0.6 is now available
-----Original Message-----
From: Bergman, Ron [mailto:Ron.Bergman at HITACHI-HKIS.COM]
Sent: Monday, April 09, 2001 8:01 AM
To: IMAGING at FORUM.UPNP.ORG
Subject: Media Standardized Names, Version D0.6 is now available
All,
The latest draft is now available at:
ftp://ftp.pwg.org/pub/pwg/media-sizes/pwg-media-06.pdf (or .doc)
I will not repeat the abstract here or the list of changes. This
information is
available within the document, if you are interested. The major change to
this
version is the addition of the "Media Finish Names".
This document will have a final review in the PWG meetings during the week
of April 23rd and should then be ready for last call.
Ron Bergman
Hitachi Koki Imaging Solutions