[udig-devel] dpi issues

[andrea antonello]

>  >You are telling me that if you zoom in one of your BIRT created pdfs
>  >you do not see grained curves and so on?
>
>  Oh I certainly do, but in a '300 dpi' output the blockiness is only
>  seen by zooming in 4x more than in a '72 dpi' output.

Yeah, that is what I wanted to hear. So that means you are right in
your assumptions and I am pretty glad to be wrong. Then this seems
really to be only an itext limit, which makes me wonder, since it is a
very advanced library. I will have to check that back absolutely.
Thanks for pointing that out.

Andrea

>  I should say that the method I'm using, which was based on code from
>  some udig snippet somewhere (and feedback from this list) effectively
>  allocates a much bigger BufferedImage for the 300 dpi case - the
>  image needs, of course, to have one pixel for each 'dot' in the
>  dpi. That image is handed over to BIRT and BIRT creates the report
>  (it has a choice of pdf, postscript, html, doc, ppt, etc).  I've only
>  really used html, pdf outputs.
>
>  Here's the basic code:
>
>  mult = ((double) dpi) / 72.0;
>
>  /**
>   * Note: TYPE_INT_ARGB produces colour-inverted PDF images for some
>  reason. Since we prefer
>   * nice pdf reports to worrying about transparency, we use TYPE_INT_RGB.
>   */
>  int type = BufferedImage.TYPE_INT_RGB;
>  BufferedImage image = new BufferedImage((int) (width * mult), (int)
>  (height * mult), type);
>
>  Graphics2D g = image.createGraphics();
>
>  [snip]
>
>  DrawMapParameter dmp = new DrawMapParameter(g, new
>  java.awt.Dimension((int) (width * mult),
>  (int) (height * mult)), map, bs, dpi, style, new NullProgressMonitor());
>  try {
>  ApplicationGIS.drawMap(dmp);
>  }
>  catch (RenderException e) {
>  logger.log(Level.WARNING, "Problem drawing Map:" + e);
>  }
>  finally {
>  g.dispose();
>  }
>
>  try {
>  mapImageFile = File.createTempFile("ewo", "." + getImageExtensionType());
>  ImageIO.write(image, getImageExtensionType(), mapImageFile);
>  fis = new FileInputStream(mapImageFile.getPath());
>  }
>  catch (IOException e) {
>  logger.log(Level.WARNING, "Problem writing Map report image " + e);
>  }
>
>  return fis;
>
>  // and 'fis' is used by BIRT.




>
>  Vince.
>
>  Vince Darley
>  CEO, Eurobios UK Ltd
>  Tel: +44 207 921 0445
>  Mobile: +44 794 154 8527
>  www.eurobios.com
>
>
>
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