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https://issues.apache.org/jira/browse/SHINDIG-1665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13227990#comment-13227990
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Richard Kettelerij commented on SHINDIG-1665:
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I've noticed the same issue with PNGs. What would help is a setting (in
shindig.properties) to disable image rewriting altogether. Currently it's only
getting in the way.
As a workaround I've excluded PNG files from being rewritten using
"shindig.content-rewrite.exclude-urls". While PNG files are now rendered
correctly it also causes PNGs to be served directly from the original gadget
host. No proxying is happening, which is unfortunate especially in a secure
(SSL) environment.
> Shindig BasicImageRewriter corrupted transparant png images with proxy
> ----------------------------------------------------------------------
>
> Key: SHINDIG-1665
> URL: https://issues.apache.org/jira/browse/SHINDIG-1665
> Project: Shindig
> Issue Type: Bug
> Components: Java
> Affects Versions: 2.0.2, 2.5.0
> Reporter: Henry Saputra
> Labels: patch, rewriter
> Fix For: 2.5.0
>
>
> Shindig "optimizes" images before caching them to reduce space. However,
> during this optimization PNG images with transparency get corrupted.
> The problem seems to happen in ImageUtils.palettize when used by
> PNGOptimizer#rewriteImpl.
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