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我正在尝试运行 im4java 来比较图像，但我收到以下异常消息。

我已按照以下链接添加 ImageMagick 的步骤：https ://www.imagemagick.org/script/download.php#macosx

我遇到了同样的错误，所以我在 eclipse 的运行配置中添加了环境变量：

DYLD_LIBRARY_PATH=/Users/siva/Downloads/ImageMagick-7.0.5/lib 并开始运行，但我仍然收到相同的错误消息：

我也试过：

 System.setProperty("java.library.path", "/Users/siva/Downloads/ImageMagick-7.0.5/bin/magick");

如果有人尝试在 Mac 上使用 imageMagick，请建议我必须执行哪些步骤。

我能够从终端成功运行以下命令：比较 imageone.png imagetwo.png diffimage.png

import java.io.IOException;
import java.math.BigDecimal;
import java.util.ArrayList;

import org.apache.commons.lang.StringUtils;
import org.im4java.core.IM4JavaException;
import org.im4java.core.IMOperation;
import org.im4java.core.ImageMagickCmd;
import org.im4java.core.Info;
import org.im4java.process.ArrayListOutputConsumer;

public class UseImageM {
	private static final String COMPARE_COMMAND = "compare";
	private static final String ABSOLUTE_ERROR = "AE";

	private static String imageOnePath = "/Users/siva/Documents/imageEclipse/UsingImagemagick/screenshot.png";
	private static String imageTwoPath = "/Users/siva/Documents/imageEclipse/UsingImagemagick/screenshotfinal.png";
	private static String outputImageName = "outputoftheimageCompare";
	private static final int COUNT_OF_DECIMAL = 10;

	public static void main(String[] args) {
		IMOperation imOperation = new IMOperation();
		imOperation.metric(ABSOLUTE_ERROR);
		imOperation.addImage(imageOnePath);
		imOperation.addImage(imageTwoPath);
		imOperation.addImage(outputImageName);

		ImageMagickCmd compare = new ImageMagickCmd(COMPARE_COMMAND);
		ArrayListOutputConsumer outputConsumer = new ArrayListOutputConsumer();
		compare.setOutputConsumer(outputConsumer);
		BigDecimal diffPercentage = BigDecimal.ZERO;

		Info imageInfo;
		long imageSize = 0;
		try {
			imageInfo = new Info(imageTwoPath, true);

			imageSize = imageInfo.getImageWidth() * imageInfo.getImageHeight();

			compare.run(imOperation);

			final ArrayList<String> errorText = compare.getErrorText();
			if (errorText.size() == 1) {
				final BigDecimal diffCount = new BigDecimal(errorText.get(0));
				if (!BigDecimal.ZERO.equals(diffCount)) {
					diffPercentage = diffCount.divide(
							new BigDecimal(imageSize), COUNT_OF_DECIMAL,
							BigDecimal.ROUND_DOWN);
				}
			}
		} catch (final IOException | InterruptedException e) {
			System.out.println((String.format(
					"Exception happened in comparison between %s and %s.",
					imageOnePath, imageTwoPath) + e));

		} catch (final IM4JavaException e) {
			e.printStackTrace();

			// error message
			if (!StringUtils.isNumeric(compare.getErrorText().get(0))) {
				final String errorMsg = String.format(
						"Exception happened in comparison between %s and %s.",
						imageOnePath, imageTwoPath);
				System.out.println(errorMsg + e);

			}

			final BigDecimal diffCount = new BigDecimal(compare.getErrorText()
					.get(0));
			diffPercentage = diffCount.divide(new BigDecimal(imageSize),
					COUNT_OF_DECIMAL, BigDecimal.ROUND_DOWN);
		}

		System.out.println(diffPercentage);

	}

}


Console Logs:

org.im4java.core.InfoException: org.im4java.core.CommandException: java.io.IOException: Cannot run program "identify": error=2, No such file or directory
	at org.im4java.core.Info.getBaseInfo(Info.java:360)
	at org.im4java.core.Info.<init>(Info.java:151)
	at UseImageM.main(UseImageM.java:36)
Caused by: org.im4java.core.CommandException: java.io.IOException: Cannot run program "identify": error=2, No such file or directory
	at org.im4java.core.ImageCommand.run(ImageCommand.java:219)
	at org.im4java.core.Info.getBaseInfo(Info.java:342)
	... 2 more
Caused by: java.io.IOException: Cannot run program "identify": error=2, No such file or directory
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
	at org.im4java.process.ProcessStarter.startProcess(ProcessStarter.java:407)
	at org.im4java.process.ProcessStarter.run(ProcessStarter.java:312)
	at org.im4java.core.ImageCommand.run(ImageCommand.java:215)
	... 3 more
Caused by: java.io.IOException: error=2, No such file or directory
	at java.lang.UNIXProcess.forkAndExec(Native Method)
	at java.lang.UNIXProcess.<init>(UNIXProcess.java:247)
	at java.lang.ProcessImpl.start(ProcessImpl.java:134)
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
	... 6 more
Exception in thread "main" java.lang.NullPointerException
	at UseImageM.main(UseImageM.java:60)

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