how to render png images?

[eduardoarandah]

This command renders a jpg file with png extension:

$request->setOutputFile("example.png");

[Mesuva]

In case anyone stumbles across this question, there is a function setFormat that can be set on a request object. So you would have something like this:

 $request->setOutputFile('/path/to/save/capture/file.jpg');
 $request->setFormat('png');