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<dependency>
    <groupId>com.easymorse</groupId>
    <artifactId>im4java.patch</artifactId>
    <version>0.98.0</version>
</dependency>

public static void main(String[] args) {
    ProcessBuilder processBuilder = new ProcessBuilder("convert", "1.gif",
            "-resize", "64x64", "2.gif");
    System.out.println(processBuilder.environment());
    try {
        Process process = processBuilder.start();
        process.waitFor();
        System.out.println(process.exitValue());
        InputStream stream = process.getErrorStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(stream));

        for(String s=reader.readLine();s!=null;s=reader.readLine()){
            System.out.println(s);
        }

    } catch (Exception e) {
        e.printStackTrace();