Compare pdf causing issues

Aspose.PDF Product Family
1

Hello All,
I am using a compare algorithm for comparing PDFs, but I am facing several issues:

  1. When there is no change in the content, it still shows a red line or strike-through.
  2. There is an image in the header, like a logo, and even though it doesn’t change, the algorithm still flags it as an error.

How does PDF comparison work, and how can I improve this process to reduce such issues?
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2

@Vaibhavi_Lad

When comparing PDF documents, it’s important to understand how the comparison algorithm works and how to optimize it to minimize false positives, such as highlighting unchanged content.

  1. Understanding PDF Comparison: The Aspose.PDF library allows you to compare two PDF documents page by page. It highlights differences, making it easier to identify changes. However, certain settings can affect how changes are detected.

  2. Adjusting Comparison Settings:

    • Additional Change Marks: By enabling this option, you can see markers for changes that may occur on other pages, even if those changes aren’t visible on the current page being compared. This can help in understanding the context of changes.
    • Comparison Mode: Using the ComparisonMode.IgnoreSpaces setting can help focus the comparison on actual content changes rather than formatting or spacing issues. This might reduce the number of false positives when there are no real content changes.

  3. Handling Images: If your comparison algorithm flags unchanged images (like logos in headers) as errors, consider whether the comparison settings are too sensitive. You may need to implement a custom logic to ignore certain elements, such as images or specific areas of the document that are known to remain unchanged.

By fine-tuning these settings, you can improve the accuracy of your PDF comparison process and reduce the occurrence of false positives.

For more detailed guidance, you can refer to the official documentation on comparing PDF documents with Aspose.PDF for .NET here.

Sources:
[1]: Compare PDF documents|Aspose.PDF for .NET - Aspose Documentation