UPD Mail Archive: UPD> Re: IPP> registered parameters

UPD Mail Archive: UPD> Re: IPP> registered parameters

UPD> Re: IPP> registered parameters

From: Michael Sweet (mike@easysw.com)
Date: Fri Nov 10 2000 - 12:13:35 EST

  • Next message: Norbert Schade: "UPD> Fw: IPP> registered parameters"

    Norbert Schade wrote:
    > ...
    > 2a. In the last UPDF conference we were talking about using
    > registered IPP values as a common reference.
    > ...
    > As far as I know the list includes the following features:
    > Print media size
    > Page orientation
    > Print media source
    > Duplex
    > Print media type
    > There some more when it comes to Print quality or Font handling like
    > download formats.
    > ...

    First, please *do not* rely solely on a keyword-based media size
    attribute. Such things are nice for the standard sizes but
    completely ignore variable sizes. You should allow keywords *and*
    measurements, which allows the driver/printing system to do any
    necessary mapping to the "native" value(s).

    Along with variable size support you'll need to communicate the
    minimum and maximum media sizes supported.

    FWIW, if you haven't done so already, please look at Adobe's
    PostScript Printer Description specification. It has its
    limitations (no "range of values" type of options, only supports
    PostScript directly, can only provide a single UI language in each
    file, etc.), but it *does* address most of the issues that you are
    looking at now for describing printer options.

    For example, PPD files provide named sizes plus the page dimensions
    and imageable area for the printer. Variable size support includes
    orientation, min/max width/height, etc. This all allows you to map
    Windows/MacOS/UNIX/IPP media sizes to PPD sizes and visa-versa, and
    to support variable sizes as needed.

    FWIW, CUPS (http://www.cups.org) uses PPD files and maps the IPP
    attributes to PPDs and visa-versa. We've added additional CUPS-
    specific attributes to PPDs for non-PS printers to support extra
    printer drivers, etc. It works quite well.

    Michael Sweet, Easy Software Products                  mike@easysw.com
    Printing Software for UNIX                       http://www.easysw.com

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