Convert to PDF_A_1B works in Online converter but not using code

Aspose.PDF Product Family
1

Hi,
Im trying to convert a simple PDF (1 page with “Test” as text)

Test.pdf (15.7 KB)

When using the following link:

The PDF is converted fine and I can validate it too using your .Validate() method:

However, once i use Aspose.PDF version 23.3 and try to convert from code, it fails.

Dim newPdf As New Aspose.Pdf.Document(“C:\Test\Test.pdf”)
newPdf.Convert(“C:\Test\PDFConvertLog.xml”, PdfFormat.PDF_A_1B, ConvertErrorAction.None)

XML Log:

1.0 Copyright (c) 2001-2023 Aspose Pty Ltd. All Rights Reserved. 27-03-2023 13:39:40 Object is compressed The xref stream is prohibited The transparency is prohibited ('Group' key) The transparency is prohibited ('Group' key)

Can you help?

3

@EGththo,

I was able to recreate the error. I will create a ticket for the dev team.

4

@EGththo
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-54053

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.

5

Any news here? Seems strange that the online version works while using the library does not?

6

@EGththo,

I am sorry, but I went to check on the ticket, and there is no news yet.

8

@EGththo

It seems, there is a bit of misunderstanding here. It is totally OK for the conversion log to contain errors and warnings as long as all of them are marked with the attribute Convertable=“True”. It means that there were some problems in the source document, but they were automatically fixed during the conversion process.

Only if the log contains errors marked as Convertable=“False”, does it mean that there were some unrecoverable problems that prohibited the document conversion.

In this case, all the errors in the log are of the Convertable=“True” kind, and the output document is a valid PDF/A-1b (you may verify it using Adobe Acrobat Preflight or VeraPDF), so the conversion was performed successfully, the same as with the web app.

9

Hi again,
Sorry but I have to re-visit this issue, as its still not working on my end.

Test.pdf (22.2 KB)

I am using the attached “Test.pdf” file.
I start by going into your conversion url: Convert PDF to PDF/A-1B | Online and Free

Here the Test.pdf is converted fine into PDF/A-1b format.
I download the file to my computer as “TestWebConverted.pdf”

Now…

I try using Aspose.Pdf version 24.5.1, using the following code:

		var pdfDoc = new Document(@"C:\Test\Test.pdf");
		var convertRes = pdfDoc.Convert(@"C:\Test\TestPdfLog.xml", PdfFormat.PDF_A_1B, ConvertErrorAction.None);
		// Returns false

		// <Problem Severity="Error" Clause="Annex" ObjectID="17" Convertable="True">Object is compressed</Problem>
		// <Problem Severity="Error" Clause="Annex" Convertable="True">The xref stream is prohibited</Problem>
		// <Problem Severity="Error" Clause="6.4" Page="1" Convertable="False">The transparency is prohibited ('Group' key)</Problem>

		pdfDoc.Save(@"C:\Test\TestConverted.pdf");

		var newDoc = new Document(@"C:\Test\TestConverted.pdf");
		var validateRes = newDoc.Validate(@"C:\Test\TestPdfValidationLog.xml", PdfFormat.PDF_A_1B);
		// <Problem Severity="Error" Clause="6.4" Page="1" Convertable="False">The transparency is prohibited ('Group' key)</Problem>
		// <Header/>
		// <Annotations/>
		// <Fonts/>
		// <trailer/>
		// <Metadata>
		// <Problem Severity="Error" Clause="6.7.3" Convertable="True">Document information entry 'Creator' not synchronized with metadata property // 'xmp:CreatorTool'</Problem>
		// <Problem Severity="Error" Clause="6.7.3" Convertable="True">Document information entry 'Producer' not synchronized with metadata property // 'pdf:Producer'</Problem>
		// <Problem Severity="Error" Clause="6.7.3" Convertable="True">Document information entry 'ModDate' not synchronized with metadata property // 'xmp:ModifyDate'</Problem>
		// </Metadata>

		var newDoc2 = new Document(@"C:\Test\TestWebConverted.pdf");
		var validateRes2 = newDoc2.Validate(@"C:\Test\TestWebPdfValidationLog.xml", PdfFormat.PDF_A_1B);
		// File converted from Web returns true

So the main problem is this issue (for the attached Test.pdf file)

The transparency is prohibited (‘Group’ key)

I hope you can re-produce the same issue on your end and help me out.

10

@EGththo

Can you please also share the output PDF generated in your environment?

11

@asad.ali
Sure - I hope you mean the “TestConverted.pdf”
TestConverted.pdf (105.3 KB)

	var pdfDoc = new Document(@"C:\Test\Test.pdf");
	var convertRes = pdfDoc.Convert(@"C:\Test\TestPdfLog.xml", PdfFormat.PDF_A_1B, ConvertErrorAction.None);
	// Returns false

	// <Problem Severity="Error" Clause="Annex" ObjectID="17" Convertable="True">Object is compressed</Problem>
	// <Problem Severity="Error" Clause="Annex" Convertable="True">The xref stream is prohibited</Problem>
	// <Problem Severity="Error" Clause="6.4" Page="1" Convertable="False">The transparency is prohibited ('Group' key)</Problem>

	**pdfDoc.Save(@"C:\Test\TestConverted.pdf");**

I also tried to run the code again where I had set a license to Aspose.Pdf to avoid the watermark - I have attached that too, but it did not help
TestConvertedWithLicense.pdf (21.0 KB)

Also, I have attached a report from the Vera tool you mentioned, if that helps:

image.png (34.5 KB)

And … as a last thing i also attached the converted file from your Web-converter-page:

TestWebConverted.pdf (21.5 KB)

12

@EGththo

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-57245

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.