Hi, Paul,
There was little discussion about fax type scaling in the Maui meeting.
Followings are information about the scaling in classic fax,
and a proposal of UID-Scale=fax.
Regards,
Toru MAEDA
CANON Inc.
[Description in ITU-T]
Guaranteed Reproducible area for G3 fax is described in ITU-T T.4 Appendix I.
These parameters written in T.4 will be easily satisfied
by current modern scanners and printers.
[Common idea of fax image handling]
Sender:
As a sender usually adds a fax header which consists of sender's id
and time&date, on the top of scanned image,
the sending image size is few mm longer than the original image.
The width of transmitting image is the one which the receiver can print,
based on the capabilities negotiation.
Receiver:
A receiver try to print the whole image which was received.
(1)Horizontally, there will be little problem to print.
The width of A4 size is 210mm and the width of Letter size is 216mm,
but the scan lines of both A4 and Letter are 1728 dots.
Letter image with 1728 dots scanned line can be printed on A4 paper.
(2)Vertically, there will be some problem to print.
Many transmitting fax devices declare "Recording length = Unlimited"
and send a little longer image length than the paper size with a fax header.
Also the length of A4 size is 297mm, the length of Letter size is 279mm,
and the length of Legal size is 356mm.
It will be trouble to print A4 size image (297mm) on a Letter paper (279mm)
or to print Legal size image (356mm) on a Letter paper (279mm).
Many fax receivers print the scaled image so as to fit it on one page
when printing the image which is a little longer than the paper size with a
fax header or
an A4 size image (297mm) on a Letter paper (279mm),
or print multiple pages continuously to cover the whole image when printing
a Legal size image (356mm) on a Letter paper (279mm).
[Proposal]
If fax scaling is used (UID-Scale=fax)
then the printer must shrink the image so as to fit it to the page
or must print the image on multiple pages continuously so as to print the
whole image.
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MAEDA TORU
MIE Development Div. 2
CANON Inc.
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