Hi,
in theory you should get the same result but the rendering is dependent on the
forms content stream. Letting PDFBox reconstruct
the content stream might leasd to differences compared to Adobe Reader as the
details of formatting content such as text is not
part of the PDF specification. Adobe is using it's own layout model which is
not published so the current state was achieved by
looking at sample PDFs and reworking that.
I'll look into the PDF provided to get an idea where the difference is coming
from.
Having said that - as long as you didn't change the form content - using
refreshAppearance=true should't be neccesary when
flattening.
BR
Maruan
> Hi, we are having some issue when we try to flatten the form in the file
> f1040_sample.pdf
> We get slightly different results depending on the value of refresh
> appearance, in particular when we set it to true we get a slightly wrong
> positioning of the text field value.
> Shouldn't we expect the same result in both cases?
> This is the test code (PDFBox 2.0.15):
>
> @Test
> public void testFlatten() throws IOException {
> PDDocument testPdf = PDDocument.load(new
> File("/home/torakiki/tmp/delete/f1040_sample.pdf"));
> PDAcroForm form = testPdf.getDocumentCatalog().getAcroForm();
> List<PDField> fields = new ArrayList<PDField>();
>
> fields.add(form.getField("topmostSubform[0].Page1[0].YourSocial[0].f1_04[0]"));
> testPdf.getDocumentCatalog().getAcroForm().flatten(fields, false);
> File file = new
> File("/home/torakiki/tmp/delete/f1040_sample_pdfbox_no_refresh.pdf");
> testPdf.save(file);
> }
>
> I isolated the field in the test case but we also get the same result when
> flattening the whole form, I included the Acrobat version of the flattened
> pdf.
> If we flatten the whole form with refreshAppearance=false we get pretty
> much the same result as Acrobat, same number From XObjects, but if we
> flatten with refreshAppearance=true we get a lot of Form XObjects (I guess
> one for each field, even empty ones) and a slightly wrong positioning of
> the text field.
> Could you please help me understand what's the issue here?
> Thanks
>
> Here the files:
> https://www.dropbox.com/sh/rmywlrmftolvwil/AADcz1Djfe59YAm8ykKnpIN5a?dl=0
--
Maruan Sahyoun
FileAffairs GmbH
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40882 Ratingen
Tel: +49 (2102) 89497 88
Fax: +49 (2102) 89497 91
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Geschäftsführer: Maruan Sahyoun
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