Yesterday, I got a comment on Jbig2

Hi Steven,
thanks for the port to windows. It works very good, produces small pdf-file sizes. Only one strange thing happens. The generate pdf files have a huge page-size. For example if I process A4-size pages (29.7×20.9cm) @400dpi tiff or png the pdf file size is 164.9×116.6 cm.
Is it possible to fix this by the python pdf.py or is jbig2.exe responible for this?
Thanks
Armin

after check the last version pdf.py, I notice it uses a default DPI(600). Images has different DPI, so if you want to use pdf.py, you need always modify it, it is not a good solution.

Then I check the source code of jbig, and found in jbig2_page_info structure ,

struct jbig2_page_info {
  u32 width;
  u32 height;
  u32 xres;
  u32 yres;
...

we can get xres and yres, so we can directly use xres and yres to generated proper page size.

and here is the patch file

btw, you can also download the last version jbig2 from here.

P.S.

Armin became the first user, and here is his response,

Hi Steven,
thank you very much for your quick response, and the new pdf.py
which works perfect. (I checked it with my 400dpi page scans.
the pdf page size is now of the same size as the scans)

Thank you so much,
Greetings from rainy Germany :-)

Armin

Today(Oct 26, 2010), I got a email about JBIG2 Encoder win32 binary update request,

Dear Steven,

I came across your Windows compiled version of jbig2enc. It’s very
useful – thanks a lot for making it available!

I was wondering whether you might consider making a new binary from the
latest Git version, which adds support for retaining DPI information. I
have been having a lot of trouble getting it to compile myself in MinGW.

Best,

Misty De Meo

After some efforts, the win32 version jbig2enc 0.27 is out, and can be download from Windows version JBIG2 Encoder-Jbig2.exe.

btw, I used leptonlib-1.66, not leptonlib-1.58 in the compilation.

P.S.
David Foster donated US$60, thanks.

After the first release, I found a bug of jbig2.exe,
when I tried
jbig2.exe -p 1.tiff>1.jbig2
I found the created jbig2 file under Windows is bigger than under Linux, and after check, it is not correct jbig2 file.
After some efforts(sorry for my poor c/c++ and python), I fixed the bug.

P.S.
Change logs of this release

*pdf.py create correct PDF to stdout under windows
for details, please visit How to Let Python Send Binary data to stdout under Windows
*fix a bug, that jbig2.exe -p can not get the correct content, also stdout issue.