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Editorial Team
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Asked: 2026-05-16T15:13:39+00:00

I’m creating piecharts using JFreeChart , use chart.createBufferedImage(width,height) and give the buffered image to

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I’m creating piecharts using JFreeChart, use chart.createBufferedImage(width,height) and give the buffered image to IReport as an image parameter. In IReport I have an image and its image expression points to this parameter, so I can render the image. But when exported to PDF, images are covered with a black rectangle. Something about transparency or RGB, I guess.

There’s a thread here about this problem and some suggested solutions, but I couldn’t apply them to my problem, will you help me? Thanks.

The thread: http://www2.jasperforge.org/plugins/espforum/view.php?group_id=102&forumid=103&topicid=21922&page=2#24710

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1 Answer

  1. Editorial Team

    As suggested by @Pekka, this is likely a limitation of Transparency in PDF files.

    I can’t find a way to set RGB or trasparency values from JFreeChart.

    The JFreeChart class includes a createBufferedImage() method that accepts an imageType, which is subsequently used to create the BufferedImage . You may have to select the optimal one empirically.

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