PDFsharp & MigraDoc Foundation

PDFsharp - A .NET library for processing PDF & MigraDoc Foundation - Creating documents on the fly
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PostPosted: Sun May 05, 2024 8:27 am 
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Joined: Sun May 05, 2024 8:12 am
Posts: 1
Hello,

I am currently writing a program that categorizes PDFs by size an colour information.

It works well for scanned images which have only one rasterimage embedded.
I would like to expand the program to work with every PDF.

I simply need to know if there is any colour in a PDF or if its black and white.

My questions :

Is it right that i have do parse every element in each page and query its colour information
and how ist this done ?

Or is there an easier method ?

Thanks for any answer,

Chris


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PostPosted: Wed May 15, 2024 11:45 am 
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Joined: Wed May 15, 2024 7:06 am
Posts: 1
MigraDoc provides built-in classes like Color and ColorTable to represent colors within your PDF. You can access these colors and analyze them to determine if the PDF contains any color other than black.
font generator
For a simple approach, you can use:
Code:
using MigraDoc.DocumentObjectModel;

// ... (your code)

bool isColored = false;
foreach (Section section in document.Sections) {
  foreach (Paragraph paragraph in section.Paragraphs) {
    Color paragraphColor = paragraph.Format.Font.Color;
    if (paragraphColor.A != 0 || paragraphColor.R != 0 || paragraphColor.G != 0 || paragraphColor.B != 0) {
      isColored = true;
      break;
    }
  }

  // Check for colors in tables, images, and other elements
  foreach (Table table in section.Tables) {
    // Iterate through table cells, borders, and fills to check for colors
  }
  // Similar logic for images and other elements
}

if (isColored) {
  Console.WriteLine("The PDF contains color elements.");
} else {
  Console.WriteLine("The PDF likely uses black and white content.");
}


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