[pdftex] Cropping bottom margin off one-page documents.

[Jean-Christophe Dubacq]

On Wed, Sep 22, 2004 at 07:02:13AM +0000, Michael Chapman wrote:
> 
> My thanks to Sebastian Rahtz, Hans Hagen, Heiko Oberdiek, Pawel, Reinhard 
> Kotucha and Jean-Christophe Dubacq.
> 
> 
> Editing the PDF files by changing the /MediaBox line works fine,
> but as at least two people said "caution, do not change the number of bytes" 
> in the PDF file. (I'd forgotten and relearnt the hard way.)
> That creates a problem as two of the /MediaBox parameters are zero's and need 
> (typically) changing to three and four figure numbers.
> Suspect I could get around that by having some gratuitous material in one of 
> the PDF Document Information Fields and then compensating by deleting the 
> right number of bytes from there.

Include a comment or play on spaces. Sample:
90 0 obj <<
/Type /Page
/Contents 95 0 R
/Resources 94 0 R
/MediaBox [0 0 595.276 841.89]
/Parent 122 0 R
/Annots [ 104 0 R 108 0 R 109 0 R 110 0 R ]
>> endobj

This is one object taken from one of my pdfTeX documents.
If I need a few chars, I could delete as many spaces as necessary (or
newlines) as the PdF lexer allows me to. Shortest valid expression (if I
recall correctly):
90 0 obj<</Type/Page/Contents 95 0 R/Resources 94 0
R/MediaBox[0 0 595.276 841.89]/Parent 122 0 R/Annots [104 0
R 108 0 R 109 0 R 110 0 R]>>endobj

I think I gained a dozen bytes.
-- 
JCD