使用ImageMagick时BufferedReader不返回预期结果

Question

所以我正在使用ImageMagick调整图像大小。它将执行此操作，并将其另存为文件output.png。但是，它不会打印出图像的字节。我只是放屁了还是我错过了ImageMagick的意图所在。谢谢。

String[] command = {"convert", "hello.png", "-resize", "1280x720", "output.png"};
ProcessBuilder pb = new ProcessBuilder(command);
pb.redirectErrorStream(true);
Process process = pb.start();

BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line;
while((line = br.readLine()) != null){
  System.out.println(line);
}