How to create A PDF with text OCR invisible and no Unicode font incorporated

We have a code that converts TIFF (usually traveled and OCR'ed) in PDF format. Currently, I extend this code:

  1. be PDF/A compliant (or PDF/A-1b "Unicode" or PDF/A-2u).
  2. Add Unicode text 'behind' the image to make the PDF can be accessed, and
  3. while making (2), do not embed all fonts (which is allowed in PDF/A, as long as the text is invisible).

I managed to generate a PDF file that pass the test of PDF/A preflight in Adobe Acrobat 9 (we have yet a license for a newer version), and which is also consistent with other requirements above, with one of the problems during their opening in Acrobat (9) or Acrobat Reader (DC), I get the error "cannot find or create the police."

CannotFindorCreateFont.png

Currently, we use the following code to PDF in our output:

3 0 obj
<</Type/FontDescriptor/FontName/DummyInvisibleMonospace/Flags 34
/FontBBox[0 0 600 1000]/ItalicAngle 0/Ascent 1000/Descent -300
/CapHeight 700/StemV 0/MissingWidth 600>>
endobj
4 0 obj
<</Type/Font/Subtype/CIDFontType2/BaseFont/DummyInvisibleMonospace
/CIDSystemInfo<</Registry(Adobe)/Ordering(UCS)/Supplement 0>>
/FontDescriptor 3 0 R/DW 600/CIDToGIDMap/Identity>>
endobj
5 0 obj
<</Length 374>>
stream
/CIDInit /ProcSet findresource begin
12 dict begin
begincmap
/CIDSystemInfo 3 dict dup begin
/Registry (Adobe) def
/Ordering (UCS) def
/Supplement 0 def
end def
/CMapName /Adobe-Identity-UCS def
/CMapType 2 def
1 begincodespacerange
<0000> <ffff>
endcodespacerange
1 beginbfrange
<0000> <ffff> <0000>
endbfrange
endcmap
CMapName currentdict /CMap defineresource pop
end
end

endstream
endobj
6 0 obj
<</Type/Font/Subtype/Type0/Name/F1/BaseFont/DummyInvisibleMonospace
/Encoding/Identity-H/ToUnicode 5 0 R/DescendantFonts[4 0 R]>>
endobj
7 0 obj
<</Length 266193>>
stream
q 591.36 0 0 775.68 0 0 cm/I2 Do Q
BT/F1 12 Tf 3 Tr
% ...
1.34762 0 0 0.88 308.64 576.624 Tm<0043004F004D00420049004E0045>Tj
% ...
ET
endstream
endobj
8 0 obj
<</Type/Page/Parent 1 0 R/MediaBox[0 0 591.36 775.68]
/Resources<</XObject<</I2 2 0 R
>>/Font<</F1 6 0 R>>/ProcSet[/PDF/Text/ImageB]>>/Contents 7 0 R>>
endobj



Replace the name of fancy font with that of one of the 14 standard fonts, said Courier, does not help.

Unfortunately, I was not able to find or create PDF sample files that show how to add invisible text without embedding a font. I could operate without a Unicode mapping, referring to the Courier not incorporated and using WinAnsiEncoding. However, in order to use the Unicode format, I have to add some police structures, so there's a ToUnicode mapping according to the PDF/A standard, and then I can't get rid of this warning, which of course would make it unusable PDF for our customers.

I couldn't really find in the PDF specification or the PDF/A standard what exactly "do not embed a font" meant on a technical level. I assumed that this meant "leaving aside the tag /FontFile2 and police data, to which it refers", but apparently, this isn't quite the case.

If this is not possible, I might incorporate a fake police, like empty Adobe but with (empty) glyphs that have a width, but it really shouldn't be necessary if I understand standards.

Any help or tips at least are appreciated.

Published by: Gerben your; separate long lines in the code.

Published by: Gerben your; Comment on Adobe-Blank as police.

But it's a required parameter with sense. Encoding is highly relevant for embedded and not embedded fonts. So it must be good, not just there... and it is not normal for a substitution font...

Tags: Adobe Developers

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