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From "Charles Matthew Chen (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (SANSELAN-5) Can't convert PNG image to GIF image
Date Wed, 16 Jul 2008 08:29:31 GMT

     [ https://issues.apache.org/jira/browse/SANSELAN-5?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Charles Matthew Chen resolved SANSELAN-5.
-----------------------------------------

    Resolution: Fixed
      Assignee: Charles Matthew Chen  (was: Carsten Ziegeler)

Fixed two issues in the PNG reader.  Wasn't handling the 16-bit mode 4 PNGs properly.  Also,
wasn't gamma-correcting non-palette values properly in PNGs.

> Can't convert PNG image to GIF image
> ------------------------------------
>
>                 Key: SANSELAN-5
>                 URL: https://issues.apache.org/jira/browse/SANSELAN-5
>             Project: Sanselan
>          Issue Type: Bug
>         Environment: Windows XP SP2, Eclipse IDE, Custom Java database conversion program,
JRE 1.5.x
>            Reporter: Dirk Daems
>            Assignee: Charles Matthew Chen
>            Priority: Blocker
>         Attachments: 12118.png
>
>
> I want to transform a set of PNG images to GIF images.
>  
> The code I tried:
> private static void convertImage(String sourceDir, String sourceFile, String targetDir){
>   try{
>  
>    BufferedImage source = Sanselan.getBufferedImage(new File(sourceDir + File.separator
+ sourceFile));
>    String targetFile = sourceFile.substring(0, sourceFile.indexOf('.')) + ".gif";
>    Hashtable parms = new Hashtable();
>    // parms.put(SanselanConstants.PARAM_KEY_VERBOSE, Boolean.TRUE);
>    Sanselan.writeImage(source, new File(targetDir + File.separator + targetFile), ImageFormat.IMAGE_FORMAT_GIF,
parms);
>  
>   }
>   catch(Exception ex){
>    ex.printStackTrace();
>   }
>  
>  }
>  
> I don't get any errors but the image that's generated cannot be displayed and is way
too small (2kb).
> I attached an example of a PNG file I can't seem to convert.

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