Charts with transparent image in jasper reports

Question

Using JFreeChart, Jasper Reports and Jaspersoft Studio, I try to generate the following chart:

But when I generate a PDF in Jaspersoft Studio, I get the following:

I'm using an image mask with transparency, which corresponds to this:

Is there a config in jasper studio/reports that helps to fix this?

Answer 1

After many tests, I've found the problem. In Jaspersoft studio, choose the chart of your interest, and In chart options, go to Renderer Type and choose image.