Am 11.01.2017 um 12:47 schrieb Gilad Denneboom:
I'm facing a different issue now that maybe you can help me out with...
After writing the decoded document to a text file I can edit it manually
and it works fine. However, if I want to edit it in my code I obviously
need to read it in as a binary file, right? But then I only get an array of
bytes. How I can split that into lines so I can perform String
manipulations on the image definition line, and then compose it back into a
valid PDF file?
So you want to do this programmatically. The trick then is to read the
tokens from the content stream. See the RemoveAllText.java example for
how to do this. Instead of looking for TJ, look for cm and Do.
All this will only work if all your files are somewhat similar.
Tilman
On Wed, Jan 11, 2017 at 10:18 AM, Gilad Denneboom <[email protected]
wrote:
Thanks, I'll give it a try!
On Wed, Jan 11, 2017 at 12:03 AM, Tilman Hausherr <[email protected]>
wrote:
Am 10.01.2017 um 23:37 schrieb Gilad Denneboom:
Hi all,
I'm trying to manipulate an existing image in my PDF file (double it in
size, for example), but I'm coming up short-handed... Any tips on how to
approach this using PDFBox? Is it at all possible?
Thanks in advance!
The easiest way would be to edit the PDF. Run WriteDecodedDoc to get an
uncompressed PDF, find where the image is invoked, then change the "cm"
parameters just before the image is invoked. Usually the cm command is like
this:
width 0 0 height xpos ypos cm
(You can also view it with PDFDebugger, but you can't change it)
if you edit the PDF make sure that the offsets stay identical. (position
of "endstream")
When done, open the PDF with Adobe Reader and save it. It will be
compressed again.
Tilman
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