when you select a color for the background of a JFreeChart,
if your ChartPanel is double buffered and your color is not totally opaque you
have a color darker than the one you have selected.
it's because the image you create for the buffer have a black background.
I think that you should replace that with a white background to have
a good color even with transparency.
It work ok if you don't have a doublebuffered ChartPanel of course.
Thank you for the great work on JFreeChart.
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