[pdftex] Overprint/Knockout with \pdfobj / \pdfximage

[William F. Adams]

On Tuesday, May 25, 2004, at 10:18  AM, JEBs wrote:

> Both of my problems (text & images) are easily configurable with PDF's 
> op/OP (overprint), OPM (Overprint mode) and TK (Text knockout) 
> attributes, EXCEPT I'm to foolish how to use them with \pdfobj, 
> \pdfximage, \pdfliteral or whatever.
> I already tried a lot combinations but didn't got ONE working.
>
> I know that it has something to do with the "Graphics State" 
> structure/parameter block and tried to use/activate it as \pdfobj or 
> \pdfpageattr but again, NONE of my tries returned the correct results.
>
> Is there anybody out there who can help me in the syntax/usage or has 
> a sample for me ?

I can't help you with the technical angle, but I have encountered this 
sort of difficulty before and've fixed it on an ad hoc basis in the 
past by printing the .pdf to PostScript from Adobe Acrobat Reader v4 
using LaserWriter driver v8.6 on either Mac OS 8.6 or 9.0.4 with 
``Force Language Level 3'' checked, but the PostScript settings set to 
emit Level 1 PostScript and then redistilling the resultant PS file.

Why this works, I dunno, but it does, and those are the only settings 
I've found which accomplish the task reliably (you wouldn't believe 
what it took in furious efforts and spurious attempts and error 
messages to puzzle the above out).

William

-- 
William Adams, publishing specialist
voice - 717-731-6707 | Fax - 717-731-6708
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