Accessibility Check on Merged PDF fails with 'Other elments alternate text - Failed'

Aspose.PDF Product Family
1

Hello ,
I am trying to merge two pdf files from trial version of Aspose 23.3 (aspose-pdf-23.3.jar)
The independent pdf files when checked for Accessibility comes fine with no errors.

After the merge however, we notice the page 2 has accessibility issue and it fails with the ‘Other elements alternate text - Failed’ error.

The code snippet is

// The path to the documents directory.
private static String _dataDir = "C:\\WD\\Activities\\merge-pdfs\\inputs\\";

private static String outputDir = "./";

public static void Merge() throws Exception {

	long time = new Date().getTime();

	// Open first document
	Document pdfDocument1 = new Document(_dataDir + "page_1.pdf");
	// Open second document
	Document pdfDocument2 = new Document(_dataDir + "page_2.pdf");
	// Add pages of second document to the first
	pdfDocument1.getPages().add(pdfDocument2.getPages());

	String outputName = outputDir + "merged_out_" + time + ".pdf";
	System.out.println(outputName);

	// Save concatenated output file
	pdfDocument1.save(outputName);
}

I m not sure how can i upload the sample files for reference. Therefore, i have shared the file from github at https://github.com/manoharanhariharan/Share/blob/main/aspose-pdf-2.zip

3

@hariharanm,

I found some issues, but I want to review them with you to be sure we are on the same page.

When I validate every document by itself, they have 2 issues, both of them have the same issues:

Document 2:

But the merge result has other accessibilities issues that were not present on the documents by themselves:

This is the report I get from merging the PDFs with the latest version of Aspose Pdf API.

Was this the problem you were talking about?

The files:

MergeDocuments_input_1.pdf (104.3 KB)
MergeDocuments_input_2.pdf (115.9 KB)

MergeDocuments_output.pdf (97.6 KB)

4

Hi Carlos,

Thanks for looking at it.
The independent files having those two issues ‘Logical Reading Order …’ and ‘Color contrast …’ are fine. What we are facing comes under Alternate Text > Other elements alternate text - Failed’
I have attached the snapshot as reference for you here.
image.png (35.6 KB)

Thanks
Hari

5

@hariharanm,

This seems to be a bug. I will collect all this data and files and submit a ticket to the dev team now.

6

Thank you very much Carlos :slight_smile:

7

@hariharanm
We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.

Issue ID(s): PDFNET-54482

You can obtain Paid Support Services if you need support on a priority basis, along with the direct access to our Paid Support management team.

1 Like
9

@hariharanm

We have completed the investigation of the ticket. If you want to keep PDF_UA (StructTreeRoot). Better to use “PdfFileEditor” with “CopyLogicalStructure”.

var doc1 = new Document($"{PartialPath}MergeDocuments_input_1.pdf");
var doc2 = new Document($"{PartialPath}MergeDocuments_input_2.pdf");
var pdfFileEditor = new PdfFileEditor()
{
    CopyLogicalStructure = true,
    KeepActions = true,
    CopyOutlines = true
};
pdfFileEditor.Concatenate(new Document[] { doc1 }, doc2);
doc2.Save($"{PartialPath}MergeDocuments_output_fe.pdf");

The result of the code snippet keeps “StructTreeRoot” information and looks better.
MergeDocuments_output_fe.pdf (171.7 KB)

10

Hi Asad, thanks for replying.
I tried your approach and found that it works fine when we try as below

pdfFileEditor.Concatenate(new Document[] { doc1 }, doc2);

but, if i try below, it fails with same error.

pdfFileEditor.Concatenate(new Document[] { **doc2** }, **doc1**);

I m uploading snapshot of the source implementation for your reference.
image.png (23.3 KB)

Also, i am attaching the output that t
merged_out_1706082834461.pdf (276.8 KB)

the file generated
image.png (31.4 KB)

11

@hariharanm

It looks like you are using an older version of the Java API. Please use the latest version i.e. 24.1 with a valid license and share with us if you still notice this issue. We will further proceed to assist you accordingly.

12

Hi Asad,
As suggested by you., i used the latest 24.1 and i m still seeing the issue in the generated document.
Please find attached pdf for your reference.
image.png (31.0 KB)

Thanks

13

@hariharanm

Thanks for the confirmation. Would you kindly share the sample input document as well for our reference? We will log a dedicated ticket in our issue tracking system for this case and share the ID with you.

14

Its the same document that I had attached previously. However, i am attaching them again for your quick reference here.
MergeDocuments_input_1.pdf (104.3 KB)

MergeDocuments_input_2.pdf (115.9 KB)

Thanks
Hari

15

@hariharanm

We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.

Issue ID(s): PDFJAVA-43523

You can obtain Paid Support Services if you need support on a priority basis, along with the direct access to our Paid Support management team.