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

["Tilman Hausherr (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-3876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16097122#comment-16097122 ] 

Tilman Hausherr commented on PDFBOX-3876:
-----------------------------------------

Setting overprint is not related to a colorspace. You have to set the extGState in the content stream for the parts where you want it to apply, i.e. at the moment when you set the colorspace. (Having it in the resources is not "setting it")
See
https://stackoverflow.com/questions/38433534/pdfbox-inconsistent-co-ordinate-system-how-do-i-draw-a-rectangle
and
https://stackoverflow.com/questions/40267719/pdfbox-2-1-0-when-printed-from-ie11-transparent-text-watermark-has-opaque-ba
for examples where people call setGraphicsStateParameters(). Your current code just creates empty pages unless createPageContentStream does more than just calling the same constructor.

Closing as this isn't a bug but a "how to" question, which belong on the mailing list or on stackoverflow (where you asked the same, I'll answer there later this weekend if nobody else does)
https://pdfbox.apache.org/support.html


> Setting “overprint=true” for a specific ColorSpace on PDF (not the entire PDF Page)
> -----------------------------------------------------------------------------------
>
>                 Key: PDFBOX-3876
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3876
>             Project: PDFBox
>          Issue Type: Bug
>            Reporter: Muthukumar R
>
> 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:
> {code:java}
> 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);
>         }
>     }
> {code}



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