DOCBOOK-APPS: Re: selecting imagedata for fo and html,scaling using depth

[Bob Stayton <bobs@caldera.com>]

On Fri, Mar 01, 2002 at 12:13:17AM +0100, Norman Walsh wrote:
> / Bob Stayton <bobs@caldera.com> was heard to say:
> | On Sun, Feb 24, 2002 at 04:37:07AM -0500, Stephen Bannasch wrote:
> |> I would like to use a scaled high-resolution image for
> |> fo and an unscaled lower resolution image for html output.
> |> 
> |> [workaround using scaling]
> |
> | You have raised a good issue regarding
> | the processing of images.  Quoting the Definitive Guide
> | reference page for <mediaobject>:
> |
> |   "For example, a MediaObject might contain a video, a high
> |   resolution image, a low resolution image, a long text
> |   description, and a short text description. In a 'high
> |   end' online system, the video is used. For print
> |   publishing, the high resolution image is used. For other
> |   online systems, either the high or low resolution image is
> |   used, possibly including the short text description as the
> |   online alternative. In a text-only environment, either the
> |   long or short text descriptions are used. "
> |
> | This sounds like exactly what you want, but
> | the current XSL stylesheets don't do this.  The html
> | and fo stylesheets both use the same 'select.mediaobject'
> | template, which is in common/common.xsl.   That template
> | currently doesn't try to select an image appropriate for
> | its output medium.  I suspect this is just an unfinished
> | feature of the stylesheets.
> 
> Right. I'm not sure I knew how unfinished until today, but...
> 
> I've always assumed that one would use the format to distinguish the
> images (high-res .EPS for print and low-res .PNG for HTML) but that's
> not going to be sufficient.
> 
> A class attribute? Roles? PIs? Hmmm...

How about a 'media' attribute?
The <mediaobject> element was designed to
support different output for different media,
so why not explicitly identify which media
for each?

-- 

Bob Stayton                                 400 Encinal Street
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                                            email: bobs@caldera.com