Re: JPEG decoder not available in PIL
On 6 Dec 2005 14:02:37 -0800, Peter wrote: I have a problem which seems to come up from time to time but I can't find anything relevant in the archives. I have used PIL v1.1.5 with no problem on Windows for some time but now wish to put it on Linux (Suse Linux v10.0). I obtained and built the JPEG libraries (jpeg-6b) without any problem. The tests for the installation work fine. I built Python 2.4.2 from the sources but with no special options, just 'out of the box'. This works fine. PIL built as it should but the selftest.py fails with the 'decoder jpeg is not available' message (the other 54 tests are OK). Other images are opened and shown with xv, no problem. I think that there is something wrong with the libraries or the way they linked. It seems you did not build the RPMs for the JPEG libraries, so the include files were not placed in the correct location: # rpm -ql libjpeg-devel ... /usr/include/jpeglib.h ... Perhaps you should try yum install libjpeg libjpeg-devel if Suse supports yum. -Paul -- http://mail.python.org/mailman/listinfo/python-list
JPEG decoder not available in PIL
I have a problem which seems to come up from time to time but I can't find anything relevant in the archives. I have used PIL v1.1.5 with no problem on Windows for some time but now wish to put it on Linux (Suse Linux v10.0). I obtained and built the JPEG libraries (jpeg-6b) without any problem. The tests for the installation work fine. I built Python 2.4.2 from the sources but with no special options, just 'out of the box'. This works fine. PIL built as it should but the selftest.py fails with the 'decoder jpeg is not available' message (the other 54 tests are OK). Other images are opened and shown with xv, no problem. I think that there is something wrong with the libraries or the way they linked. At the last moment I managed to solve this problem and I hope it is worth supplying the details here. First there is a file in the install directory libImaging/Jpeg.h which has a line: #include jpeglib.h but there is no such header file. On my system I put: #include /usr/local/include/jpeglib.h which is where the JPEG installation put the include files for the library. With this change all 55 tests passed successfully. Then I copied the PIL library from the installation directory where it was built to the Python site-packages location. And then everything worked. For some reason it was not enough to do python setup.py install but this is probably an artifact of previous failures. Hope this helps someone ... Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: JPEG decoder not available in PIL
Peter wrote: At the last moment I managed to solve this problem and I hope it is worth supplying the details here. First there is a file in the install directory libImaging/Jpeg.h which has a line: #include jpeglib.h but there is no such header file. On my system I put: #include /usr/local/include/jpeglib.h which is where the JPEG installation put the include files for the library. With this change all 55 tests passed successfully. This is bad! You're mixing two libraries here, for one the system jpeg library and for another your library. Probably the dynamic loader cache finds the system library first, so although you included the specifications for the library you installed to /usr/local, you link against the system library which might be different (in this case it is not and for jpeglib will never be, but nevertheless, this is an absolute NONO). PIL comes precompiled for SuSE, btw., and the package is called Imaging, IIRC (long time since I've tried SuSE). Next time round you want to install something, read up on the distinction between pkg and pkg-devel. The former contains only the files necessary at runtime (thus, no static libraries, no headers, etc.), while the latter contains everything the package installs that isn't in the former. Thus, to install PIL you should have done: rpm -Uvv libjpeg-devel-something.rpm or installed libjpeg-devel using the SuSE package manager. Then the PIL intallation would have found the appropriate header files and compiled successfully. Actually, you must have installed python-devel for the installation package to succeed. Or did you build Python yourself and overwrote the standard python that was installed? If so, really do read up on package management using RPM, there's quite a lot on this on SuSE's site. Otherwise you'll wreck your system in the longrun... --- Heiko. -- http://mail.python.org/mailman/listinfo/python-list
Re: JPEG decoder not available in PIL
Peter wrote: At the last moment I managed to solve this problem and I hope it is worth supplying the details here. First there is a file in the install directory libImaging/Jpeg.h which has a line: #include jpeglib.h but there is no such header file. On my system I put: #include /usr/local/include/jpeglib.h which is where the JPEG installation put the include files for the library. note that the setup file does in fact pass in /usr/local/include via the compiler's -I option, so if the above fix made things work, your compiler setup is pretty weird... or maybe you have conflicting versions of libjpeg installed in different locations? (but I don't think there has ever been conflicting releases of libjpeg, so that doesn't seem likely...) /F -- http://mail.python.org/mailman/listinfo/python-list