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Added horizontal compare.
Gived 2 pdf generate a third pdf where for each page you can find on the left the page of first pdf and on the right the page of the second pdf.
Here an example on how use it...use setEnableHorizontalCompareOutput..
PdfComparator compare = new PdfComparator("input/input1.pdf", "input/input2.pdf");
boolean flagLeftRight = true;
compare.headerLeft = "LEFT";
compare.headerRight = "RIGHT";
compare.withEnvironment(new SimpleEnvironment().setActualColor(Color.red).setParallelProcessing(true)
.setMaxImageSize(100000).setDocumentCacheSize(0).setOverallTimeout(15)
.setExpectedColor(Color.CYAN).setAddEqualPagesToResult(true).setDPI(DPI)
.setEnableHorizontalCompareOutput(flagLeftRight).setAllowedDiffInPercent(pixel));
CompareResult result = compare.compare();