imagick convert png to jpg in java with im4java

Question

I need to convert from PNG to JPG.

However, iMagick adds a black background to it.

I saw this question which is for PHP, and tried to write the same for java like this:

// create the a jpg image
ConvertCmd cmd = new ConvertCmd();
// create the operation, add images and operators/options
IMOperation op = new IMOperation();
op.addImage(brandingURL);
op.format("JPEG");
op.composite();
op.background("white");
op.addImage(imageLocation);
//op.transparent();
// execute the operation
cmd.run(op);

But still, the image comes out with a black background.

What am I missing?

Answer 1

I had to write the code like this:

 Info imageInfo = new Info(brandingURL, true);
 IMOperation op = new IMOperation();
 op.addImage(brandingURL);
 op.size(imageInfo.getImageWidth(), imageInfo.getImageHeight());
 op.addImage("xc:white", "c://write//test.jpeg");
 op.addImage("c://write//test.jpeg");
 CompositeCmd composite = new CompositeCmd();
 composite.run(op);