Dear IPP Working Group,
My name is Tomomi Shiraki from Brother.
I would like to ask a few questions regarding the following discussion to better understand the current IPP specification design.
https://ftp.pwg.org/pub/pwg/ipp/minutes/ippv2-f2f-minutes-20250812.pdf
"Canon/Mopria questions/feedback on PWG Raster and media-source-properties:"
1.(ippv2-f2f-minutes-20250812.pdf P.3)
> Michael Z: Do we need to support rotation for long-edge feed?
> ⁃ Mike: We made the choice to require long-edge feed to support it, most current clients support media[1]source-properties, but might not know/specify which tray at job creation…
Question) Which is the desired behavior for a PWG-raster printer that supports long-edge paper feed for an particular paper size and tray, and for plain paper?
A. The printer notifies the m-s-f-orientation and m-s-f-direction and expects the client to rotate the image for long-edge feed paper.
B. The printer rotates the image for long-edge feed paper itself, regardless of whether it notifies m-s-f-orientation and m-s-f-direction.
(ippv2-f2f-minutes-20250812.pdf P.4)
> Slides 19-24:
> Four printing methods today:
> ⁃ PWG Raster: Client does all the necessary rotation"
Question) Is the case of long-edge feed paper excluded from this general rule?
2.(ippv2-f2f-minutes-20250812.pdf P.3)
> Slide 5:
> ⁃ Mike: Mostly correct, but when there isn't a m-s-p the expectation is that the End User will choose an orientation and the Client software will apply any rotation prior to sending a portrait page image to the Printer"
> Slide 6:
> The orientation (portrait, landscape, reverse-portrait, reverse-landscape) is ordinarily an End User choice for regular sheet media - only forced for ""special"" cases (envelopes, letterhead, etc.
Question) For regular sheet media cases, if the printer notifies a single m-s-p entry for an particular paper size and tray as shown below, what is the expected behavior of the client:
{A4, tray-1, short-edge-first, 3 (portrait), stationaly}
A. Ignore the m-s-p and show users orientation settings such as portrait and landscape (two directions), or portrait, landscape, reverse-portrait, and reverse-landscape (four directions).
B. Refer to the m-s-p and show users only one orientation (Portrait).
3.
How does a client distinguish whether the sheet media is "special" cases (envelopes, letterhead, etc.)? Is this determined by media-type?
(ippv2-f2f-minutes-20250812.pdf P.4)
> Slides 19-24:
> Michael Z: Can already do this as a custom media type, provide it in the media-col-database/ready with the correct orientation value
> ⁃ Smith: Have plastic media types but nothing for ""bags"""
4.(ippv2-f2f-minutes-20250812.pdf P.4)
>Slides 12-18:
> ⁃ Mike: Listing multiple media-col-ready values with multiple media from the same source breaks existing clients and is non-compliant"
Question) For "special" media cases such as envelopes, can users generally print in only one orientation? For example:
media-col-ready {C5, by-pass-tray, short-edge-first, 3 (portrait), envelope} -> The user can print only in "Portrait" orientation.
media-col-ready {C5, by-pass-tray, long-edge-first, 3 (portrait), envelope} -> User can print only "Landscape" orientation ( long-edge feed + 0 degrees = landscape aspect image, as shown in section 4.2 of wd-ippenvelope10-20250529.pdf .)
media-col-ready {C5, by-pass-tray, long-edge-first, 5 (reverse-landscape), envelope} -> User can print only "Portrait" orientation (long-edge feed −90 degrees = portrait aspect image, as shown in section 4.2 of wd-ippenvelope10-20250529.pdf.)
I would appreciate it if you could comment on these questions. We would like to continue working on improving the compatibility of our products.
Best regards,
Tomomi Shiraki
Brother Industries, Ltd.
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