[PDFBOX-3876] Setting “overprint=true” for a specific ColorSpace on PDF (not the entire PDF Page)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Labels: how-to
• Assignee: Unassigned
• Reporter: Muthukumar R
• Created: 21/Jul/17 20:52
• Updated: 23/Jul/17 05:37
• Resolved: 22/Jul/17 05:40

Description

I have a requirement to set overprint=true at ColorSpace level on a "PDF" (not for the entire PDF Page). I'm trying to solve this using PDFBox.

Again, I want to apply overprint only for a specific colorSpace (see If condition in the sample code below), but graphicsState.setStrokingOverprintControl(true); seems to be setting overprint for the entire PDF Page (all colorSpaces).

Here's the sample code. Anyone came across this problem? Am I missing something?

Sample code:

public static void fixPdfOverprint(String inputFilePath, String outputFilePath) throws IOException {
        final ByteArrayInputStream pdfStream = new ByteArrayInputStream(readFileIntoMemory(inputFilePath));
        try(PDDocument document = PDDocument.load(pdfStream)) {
            for (PDPage page : document.getDocumentCatalog().getPages()) {
                try(PDPageContentStream contentStream = createPageContentStream(document, page)) {
                    PDExtendedGraphicsState graphicsState = new PDExtendedGraphicsState();
                    PDResources pdResources = document.getDocumentCatalog().getPages().get(0).getResources();
                    for (COSName cosName : pdResources.getColorSpaceNames()) {
                         if(cosName.getName().equals("<my specific colorSpace>")) {
                           graphicsState.setStrokingOverprintControl(true); // Why this is setting for the entire page rathen than just this colorSpace. Btw - I confirmed that this if condition is correct.
                         }
                    }
                    contentStream.setGraphicsStateParameters(graphicsState);
                }
            }

            document.save(outputFilePath);
        }
    }