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// For complete examples and data files, please go to https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java
String sourcePath = Utilities.sourcePath + sourceFile;
String targetPath = Utilities.targetPath + targetFile;

ComparisonDjvuImage sourceImage = new ComparisonDjvuImage(sourcePath);
ComparisonDjvuImage targetImage = new ComparisonDjvuImage(targetPath);
ImagingComparisonSettings settings = new ImagingComparisonSettings();

//Compare
IImageCompareResult cr = sourceImage.compareWith(targetImage, settings);
IPdfDocument resultPdf = cr.getPdfDocument();

//save results into a file
resultPdf.save(Utilities.outputFileName(extension));