Why merge pdf is flipped with example..

[sqxccdy]

use example fancy_watemark.py or watermark.py go to run it.

But the resulting watermark are all horizontal and vertical flip.

watermark with reportlab generate.for example

c = canvas.Canvas('transafe.pdf')
c.drawString(0,0,'hello') 
c.save()

Thanks in advance
Please tell me how to change it ..

[ThomasWaldmann]

@sunqianxiang i wrote some code based on the fancy_watermark.py, no issue with flipping.

[pmaupin]

Either your watermark or your PDF pages are probably rotated. (Probably the PDF page, I think rotation for the watermark is handled.) If you have examples (especially if you have examples I can add to the test suite) please email them to me and I will fix.

Thanks,
Pat

[sqxccdy]

but I maybe need normal merger..Such as for example with PyPDF2..

from PyPDF2 import PdfFileWriter, PdfFileReader
output = PdfFileWriter()
ipdf = PdfFileReader(open('output.pdf', 'rb'))
wpdf = PdfFileReader(open('transafe.pdf', 'rb'))
watermark = wpdf.getPage(0)
for i in xrange(ipdf.getNumPages()):
   try:
      page = ipdf.getPage(i)
      page.mergePage(watermark)
      output.addPage(page)
   except:
      pass
with open('newfile.pdf', 'wb') as f:
   output.write(f)

here generate not flipping pdf from code..but it have problem in pdf 1.4.
i think watemark need custom options or providing method to adjustment.
in pdf1.4 maybe have the problam.i can send mail to you for my pdf file..
Thanks in advance

[pmaupin]

Thank you for this bug report. I have checked in some code on a new branch that fixes this problem.

When I did a rewrite of my merge code, I forgot to save graphics state if the object was a regular page and not a form XObject. Most PDFs work fine this way, but your example PDF alters the graphics state and leaves it altered (which is perfectly legal, but which I did not have a failing PDF for).

I have not yet checked the fix into the master because I will first need to update expected checksums for the output of the watermark test. There is one changed file, here:

https://github.com/pmaupin/pdfrw/blob/pagemerge_state_save_restore/pdfrw/pagemerge.py

Please verify it works on all your files.

Also, if you can create a non-sensitive file that the old one fails on and the new one works on I will add it to the test suite.

@ThomasWaldmann -- you may also want this fix, depending on how much control you have over the PDFs you are watermarking -- it is a definite bug in pdfrw, but the PDFs you provided so far did not provoke it.

Thanks,
Pat

[claytonbrown]

yup, works fine, had the same issue

[takluyver]

The branch to fix this is now merged, so I'm closing this issue.