UPD Mail Archive: Re: UPD> Re: IPP> MED - Media Standardi

Re: UPD> Re: IPP> MED - Media Standardized Names Draft D0.4 down-loaded

From: Jim Sommer (sommer@granitesystems.com)
Date: Thu Mar 29 2001 - 15:16:46 EST

  • Next message: Norbert Schade: "UPD> min/max custom size values"

    I agree with Michael, I think we should define the keywords that are used
    to identify the smallest and largest user-defined, custom paper sizes.
    These two "paper sizes" can appear in the list of supported sizes and
    indicate that custom sizes are supported and the range of allowable sizes.

    I think it fits in perfectly with what we're trying to do with this document.


    At 3/29/01 03:09 PM, Michael Sweet wrote:
    >"Bergman, Ron" wrote:
    > > ...
    > > I disagee with your proposal for adding printer size restrictions
    > > to the document. So far this specification has only involved
    > > attributes related to media. Now you are proposing that we add
    > > an attribute that is related to printers. This belongs in the
    > > appropriate UPnP or IPP or other document that defines how to
    > > describe a printer. If we add this then it will be necessary
    > > ...
    >I'm not sure I agree with this (or maybe I just not understanding
    >your objection right); the purpose of this standard/spec is to
    >define the names used for media sizes, types, finishes, etc. so
    >that other protocols can then use those names uniformly.
    > From an implementation standpoint, it may be desireable to have
    >media size names that are reserved for representing 1) whether
    >custom media sizes are supported, and 2) what the size limits are
    >for the device being queried. This allows all protocols to use
    >a common method for conveying the custom media size information,
    >while the exact values used in the custom size names are determined
    >by the device and not the protocols or this spec.
    >IPP contains no explicit support for custom media sizes; CUPS
    >works around this limitation by supporting a "custom" media size
    >keyword and relies on the to know that they can request a custom
    >media size using the name "custom.WWWxLLL", where "WWW" and "LLL"
    >are the width and length of the media in points (works well for
    >a PS-based printing system... :) This only works for CUPS, and
    >I have no idea what Microsoft does, for example, with their
    >media support under Windows 2000...
    >So, I guess what I'm saying is this:
    > 1. Describe "custom-min" and "custom-max" media size names
    > and the format they use. Specify that these names will
    > only be present for devices that support custom sizes, and
    > that both must appear if they are used at all.
    > 2. Explicitly state that the values used in the custom-min/max
    > names are defined by the device and not the spec.
    > 3. Explicitly state that the units for media sizes in the
    > size names are set by the media spec and not by the
    > protocol spec. Units outside the size name can obviously
    > be anything the protocol wants...
    >#1 will make sure that any client can determine if a device supports
    >custom sizes, no matter what protocol is being used.
    >#2 will remove any requirement for additional info in the media spec
    >on how to manage custom sizes.
    >#3 will ensure that the dimensions in size names are consistent no
    >matter what protocol is being used.
    >Michael Sweet, Easy Software Products mike@easysw.com
    >Printing Software for UNIX http://www.easysw.com

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