Hastings, Tom N wrote:
> ...
> I did go back to [RFC2911] and the definition of "pdl-override" Printer
> Description attribute has a reference to section 15.2 which has exactly the
> example of the media in the PDL being 'iso-a4' and the IPP "media"
> attributes being 'na-letter' that you cite as unclear. Do you think it
> needs further clarifcation (about "media" size and other attributes)?
> ...
OK, the "problem" with this section is that PDF and other document
types (e.g. TIFF) do not actually contain printer commands. They
may have a certain natural size associated with them, but we do not
define what behavior should be supported when the natural page size
of a document differs from the media/media-default attributes.
The current section *does* address printer PDLs but does not address
document formats in general; does a file that won't fit on the
selected media get scaled, cropped, or does it override implicitly?
Ideally, it would be useful to define an attribute
(pdl-media-override?) that specified the desired behavior, e.g.:
pdl-media-override (type2 keyword)
"none" - Do not attempt to override the natural media
selections in the document.
"fit" - Scale document pages to fit the job media.
"center" - Scale larger document pages to fit the job media
and center smaller pages within the job media.
CUPS currently uses "center" for PDF files, "none" for HP-GL/2,
and has additional attributes for images (the default is roughly
equivalent to the "none" behavior, although CUPS will split an
image onto multiple pages to get the "natural" size...)
-- ______________________________________________________________________ Michael Sweet, Easy Software Products mike at easysw dot com Printing Software for UNIX http://www.easysw.com
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