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Subject: Re: DOCBOOK-APPS: scaling images in PDF but not in HTML?


On Sun, Apr 21, 2002 at 08:50:38PM +0200, Steinar Bang wrote:
> Platform: Intel PIII, debian testing, Blackdown Java SDK 1.3.1,
> 	  Saxon 6.4.4, DocBook XML 4.1.2, DocBook-XSL 1.48,
> 	  Fop-0.20.3rc
> 
> Is it possible to scale images in PDF, but not in HTML?
> 
> I'm writing a step by step howto with PNG screen shots as a DocBook
> XML <article>.  I'm using a <section> for each screen shot, with a the
> text accompanying the screen shot in a <para> following the screen
> shot.
> 
> The idea was that if the HTML is formatted into one HTML page per
> section (I haven't figured out how to do that yet, but I have seen it
> done), each HTML page will consist of a the <section> <title>, the
> screen shot, and the text, as well as navigation links (next, prev,
> up).
> 
> The problem is in that the PDF variant of the the same document I get
> page breaks immediately after the section header, with the screen shot
> and the text on the next page.
> 
> Ie. I get pages consisting of:
>  - a screen shot 
>  - the text of the screen shot
>  - the section title for the next screen shot
> and that's not a very efficient use of the paper.
> 
> I could put in <beginpage/> element before each section, and then at
> least the title header would appear on the same page as the screen
> shot and the text.
> 
> But that would still give me just a single screen shot per page, when
> the page can easily take two, or three, and have them remain readable.
> 
> I could scale the images in the DocBook XML source, but that would
> cause the images to scale in HTML as well as in PDF, and I would like
> the images to remain unscaled in HTML.
> 
> So we're back to the question at the start: is there a way to make the
> images scale in PDF, but not in HTML?

You might try putting two imageobject elements inside a
mediaobject inside your screenshot, and assign an
appropriate role attribute to each imageobject, such as
"html" or "pdf".  The imagedata element in each imageobject
could have different attributes for scaling the same
graphic.  Then you could use the profiling stylesheet as a
preprocessor to select which imageobject is to be used before
passing it to the html or fo stylesheet.  It is a bit
cumbersome, but it should work.  

-- 

Bob Stayton                                 400 Encinal Street
Publications Architect                      Santa Cruz, CA  95060
Technical Publications                      voice: (831) 427-7796
Caldera International, Inc.                 fax:   (831) 429-1887
                                            email: bobs@caldera.com


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