// Opens an existing EPUB file for reading.
java.io.FileInputStream fileInputStream = new java.io.FileInputStream($i("input.epub"));

// Create an instance of the ImageSaveOptions class
ImageSaveOptions options = new ImageSaveOptions(ImageFormat.Png);

// Call the ConvertEPUB() method to convert EPUB to PNG
Converter.convertEPUB(fileInputStream, options, $o("input-output.png"));