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Using Overprint - pdf with multiple layers (ocg)
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bdavid  
#1 Posted : Saturday, May 1, 2021 6:27:33 AM(UTC)
bdavid

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Italy
Location: Milan
Hi to all,

I need to implement a new option in my sw. Receiving pdfs with multilayer(OCG) I have to render them with overprint flag in order to prevent some layer cover other.
I tried using :
Code:
                    
foreach (var pgobj in page.PageObjects)
{
    pgobj.OverprintMode = OverprintModes.NonZero/Zero;
    pgobj.StrokeOverprint = true/false;
}

Nothing change in the saved image, the last layer cover others.....

David

Edited by moderator Saturday, May 8, 2021 9:34:41 PM(UTC)  | Reason: Not specified
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Paul Rayman  
#2 Posted : Saturday, May 8, 2021 9:38:32 PM(UTC)
Paul Rayman

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After changing any property of the page object, you must call the GenerateContent method for the changed information to take effect.
Try calling page.GenerateContent() after your foreach loop.
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bdavid  
#3 Posted : Sunday, May 9, 2021 5:50:35 AM(UTC)
bdavid

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Posts: 2
Italy
Location: Milan
Sorry Paul,

but nothing change can I send you the pdf to check if it's possible to render it correctly?

David
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Paul Rayman  
#4 Posted : Sunday, May 9, 2021 7:57:19 AM(UTC)
Paul Rayman

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Please contact support@patagmes.com
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gffranca  
#5 Posted : Thursday, September 16, 2021 3:53:44 PM(UTC)
gffranca

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Hi,
I'm trying to load the document with overprint flag ON, but have no success yet.

Here is my code:

Code:

foreach (var page in pdfViewer.Document.Pages)
{
     foreach (var pgobj in page.PageObjects)
     {
          pgobj.OverprintMode = Patagames.Pdf.Enums.OverprintModes.NonZero;
          pgobj.StrokeOverprint = true;
          pgobj.FillOverprint = true;
     }
     page.GenerateContent();
}
pdfViewer.ClearRenderBuffer();
pdfViewer.Invalidate();

Thanks in advance!
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gffranca  
#6 Posted : Monday, November 7, 2022 9:23:19 PM(UTC)
gffranca

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Posts: 19
Brazil
Location: Rio de Janeiro

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Was thanked: 1 time(s) in 1 post(s)
Still unclear how to render or view correctly a document with Overprint. Please @Paul

Code:
using (var bmp = new PdfBitmap(width, height, true, true)){
     var page = document.Pages[Page];
     foreach (var pgobj in page.PageObjects)
     {
          pgobj.OverprintMode = OverprintModes.NonZero;
          pgobj.StrokeOverprint = true;
     }
     page.GenerateContent();

     bmp.FillRect(0, 0, width, height, Patagames.Pdf.FS_COLOR.White);
     //Render part of page into bitmap;
     page.RenderEx(bmp, 0, 0, width, height, PageRotate.Normal, RenderFlags.FPDF_LCD_TEXT);
     bmp.Image.Save("over.png");
}
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