Hi,
when using the org.apache.pdfbox.multipdf.Splitter the resulting documents
don't contain any information about the optional content (OC) blocks in the
document (see chapters 4.10 and 10.5 in the PDF 1.6 Spec) anymore, which
results in making all optional content visible.
Example (Kotlin):
URL("https://www.pdfill.com/example/pdf_layer_new.pdf";).openStream().use {
inputStream ->
PDDocument.load(inputStream).use { inputDoc ->
val resultDocs = Splitter().apply {
setStartPage(1)
setEndPage(1)
}.split(inputDoc)
val resultDoc = resultDocs.first()
// resultDoc.documentCatalog.ocProperties =
inputDoc.documentCatalog.ocProperties
resultDoc.save(File("pdf_layer_new-split.pdf"))
}
}
One can copy the ocProperties from the original document (see commented line in
example above) which seems to fix the issue, but doesn't remove unused OCGs
when they're not referenced on the split page(s).
Is this intended behaviour and is copying the original ocProperties a proper
workaround?
Thanks for your suggestions.
Best Regards,
Stefan Wurzinger
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