Re: background-image on 0.94

Sam Fuqua a écrit :

Hi Andreas,

I'm quite sure that it has an embedded resolution of 72dpi.  I opened it in GIMP, and that was the resolution that I was given.
If it does turn out to be different, then I will either resize it or try to find another way of embedding the image

Thanks

Sam

On Tue, Jun 23, 2009 at 2:06 PM, Andreas Delmelle <andreas.delmelle@... <mailto:andreas.delmelle@...>> wrote:

   On 23 Jun 2009, at 18:09, Sam Fuqua wrote:

   Hi Sam


       I'm trying to render a PDF that uses a 72dpi gif as the
       background-image in the region-before.  The image is
       considerably smaller than the size of the region and so I have
       "no-repeat" in use.
       When the PDF is returned, the image is stretched to the point
       that a 500 pixel wide image (which should fit with no issues)
       is being cut off on both ends as well as dramatically reducing
       the image quality.


   I think this may be expected, as XSL-FO does not have any
   properties related to scaling of the background image. Are you
   absolutely sure the GIF has an embedded resolution of 72dpi? (I
   have run into image viewers that simply show a default of 72dpi if
   they do not succeed in extracting the image's native resolution)
   If not, that may be the cause: if the native resolution of the
   image is significantly higher than 72dpi, the picture will appear
   stretched.


       Is there a setting I need to change on the FOP so that it does
       not distort my background image?
       If not, what recourse can I take to keep the image in?


   The usually suggested workaround (for a page-background) is to
   insert the image in the FO as a fo:external-graphic in one of the
   generally unused side-regions (region-start/region-end). Using a
   fo:external-graphic allows to control scaling via the width/height
   and content-width/content-height properties.


   HTH!

   Andreas


--

Sam Fuqua

Hi,
AFAICK, there is no place in GIF file structure for setting resolution or actual size.
Only size in pixels is set.
Read Compuserve spec for further details, (zipped files downloadable here...)
http://www.wotsit.org/list.asp?page=2&fc=1&search=&al=

In such case, FOP considers the default resolution, depending on what you have in your fop.xconf file.
Can you verify that point?

For a 72dpi resol, your 500px width image should be 6.9in (or 176.4mm).
Consider also that the available width in your region-before is equal to page-width minus margins and minus extents of start and end-regions (if precedence property is unchanged)

HTH,
Pascal

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