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https://issues.apache.org/jira/browse/PDFBOX-4797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17057100#comment-17057100
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Michael Klink commented on PDFBOX-4797:
---------------------------------------
If your PDFs do not themselves switch blend modes, you can get get a better
view of the differences by switching the blend mode from the default to
*Darken* or *Multiply* like this (here Multiply is only applied to the last
page):
{code}
try ( PDDocument document1 = ...;
PDDocument document2 = ...;
Overlay overlayer = new Overlay()) {
overlayer.setInputPDF(document1);
overlayer.setAllPagesOverlayPDF(document2);
try ( PDDocument result =
overlayer.overlay(Collections.emptyMap()) ) {
try ( PDPageContentStream canvas = new
PDPageContentStream(result, result.getPage(5), AppendMode.PREPEND, false,
false)) {
PDExtendedGraphicsState extGState = new
PDExtendedGraphicsState();
extGState.setBlendMode(BlendMode.MULTIPLY);
canvas.setGraphicsStateParameters(extGState);
}
result.save(...);
}
}
{code}
_([OverlayDocuments|https://github.com/mkl-public/testarea-pdfbox2/blob/master/src/test/java/mkl/testarea/pdfbox2/merge/OverlayDocuments.java#L48]
test {{testOverlayWithMultiply}})_
In case of your documents one now sees both the 4 and the 5 after the 11.7 in
the final result.
> Overlayed PDF file do not shows the difference
> -----------------------------------------------
>
> Key: PDFBOX-4797
> URL: https://issues.apache.org/jira/browse/PDFBOX-4797
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.19
> Environment: Java Maven
> Reporter: Andrei Toropov
> Priority: Major
> Attachments: 10.pdf, 114.pdf, 1583843507134004.overlay.PDF,
> 2020-03-10_10-34-56.png, screenshot-1.png, screenshot-2.png
>
>
> There are two differences in this two files, in the table on last page and in
> the table on the previous page the second row, column "% since inception" has
> values 11.74 in one pdf and 11.75 in another one. The textual html diff picks
> up and shows both cases. However, visual overlay shows this on page 5, but
> doesn't show on page 6.
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