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

Pete Muir (JIRA) jira-events at lists.jboss.org
Mon Mar 10 09:00:59 EDT 2008

     [ http://jira.jboss.com/jira/browse/JBSEAM-1788?page=all ]

Pete Muir updated JBSEAM-1788:

    Fix Version/s: 2.1.x

> s:graphicImage fails to transform GIF images
> --------------------------------------------
>                 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
>         Assigned To: Pete Muir
>             Fix For: 2.1.x
> 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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