[jbossseam-issues] [JBoss JIRA] Created: (JBSEAM-1788) s:graphicImage fails to transform GIF images

Sun Aug 12 18:05:00 EDT 2007

s:graphicImage fails to transform GIF images
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                 Key: JBSEAM-1788
                 URL: http://jira.jboss.com/jira/browse/JBSEAM-1788
             Project: JBoss Seam
          Issue Type: Bug
          Components: Core
    Affects Versions: 2.0.0.BETA1
         Environment: windows xp, JDK 1.6.0
            Reporter: henrik lindberg

The org.jboss.seam.ui.graphicImage.Image class fails to rescale GIF images.
This is caused by the use of BICUBIC INTERPOLATION not working for GIF images.

I see three solutions (tested in similar code in one of my servlets that suffered from the same problem):

- Use this rendering hint (in use now)
     g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
     but then change the format name to "png" when writing with image IO
- Use this rendering hint
  g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
  and render as "gif"
- Use NEAREST_NEIGHBOR if image is written as a GIF, and BICUBIC otherwise.

The combination INTERPOLATION_BICUBIC (as well as INTERPOLATION_LINEAR) simply does not work if the image is written with ImageIO in "gif" format.
The result is all white pixels. 

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