[IPP] (no subject)

[IPP] (no subject)

Anton Thomasson antonthomasson at gmail.com
Sun Aug 13 19:29:27 UTC 2023


Hi

(Seems i had fallen off the list somehow, so re-sending after
re-registering, sorry if ends up going out twice).

I was reminded that there is an Orientation setting in the PWG raster page
header, but unfortunately the spec doesn't say much about how it is to be
used.
One interpretation could be that it requests the printer to transform the
page as requested, but that would go against Design Requirement 2. So
presumably, like the transform fields, it is more of a description of what
the client has done to the page bitmap.

Is that the correct interpretation?

Is this the Orientation referred to in 6.4 c, or is that backside
transformation, or both?
Landscape output doesn't seem very popular... but achieving full compliance
would be pretty neat.

Something that has me puzzled though is how Orientation relates to the
Transform values. Table 9 has a neat reference on what to do to back pages
when the printer needs help transforming them, but it defines the
transforms in cross-feed and feed, *and* refers directly to duplex/tumble
which are edge-length-based.

Is there a dimension missing in the table to account for orientations?

I.e. if the printer is to output Landscape, Long/Short Edges are now
different relative to the feed direction compared to normal.
For "rotated", which seems most common, the table says "unless you want it
two-sided around the short edge (usually the feed direction) rotate it for
me". But surely the printer's need for help stays the same relative to the
feed direction, so now if a long edge is towards the feed direction, the
when to rotate should switch, or?

How does this relate to LeadingEdge BTW - just keep them in sync?

Br,
Anton
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