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Thread: Loading TIF images in Ubuntu

  1. #1
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    Default Loading TIF images in Ubuntu

    I have some problems loading TIF images using Qt.

    Googling gave me this:
    http://doc.qt.io/qt-5/qtimageformats-index.html

    The actual coding and decoding of the file format is done by a codec library. The codec can be Qt or third party code. In case of a third party codec, the build process will look for it among the system libraries. If not found, it may fall back on using a bundled copy (in src/3rdparty).

    On my own machine (Linux Mint 17.1, Qt 5.3.2 compiled from source), the return value of
    Qt Code:
    1. QImageReader::supportedImageFormats()
    To copy to clipboard, switch view to plain text mode 
    includes "tif" and "tiff". and consequently such images load fine.

    On a friend's machine (Ubuntu 14.04, Qt 5.2.1 that came with the installation), supportedImageFormats() does not include "tif". However,

    Qt Code:
    1. locate libtiff
    To copy to clipboard, switch view to plain text mode 
    on the command prompt shows
    /usr/lib/x86_64-linux-gnu/libtiff.so.5
    /usr/lib/x86_64-linux-gnu/libtiff.so.5.2.0

    As per the quote above, I expected Qt to find the codec "among the system libraries". What need to be done to ensure that?
    Last edited by drhex; 11th June 2015 at 07:12.

  2. #2
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    Default Re: Loading TIF images in Ubuntu

    First of all check if your friend's Qt installation includes qtiff plugin like your does.

    $ ls -1 /usr/lib/x86_64-linux-gnu/qt4/plugins/imageformats

    libqgif.so
    libqico.so
    libqjpeg.so
    libqmng.so
    libqsvg.so
    libqtga.so
    libqtiff.so
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  3. #3
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    Default Re: Loading TIF images in Ubuntu

    Yes, he gets the exact same list of libraries, including libqtiff.so

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    Default Re: Loading TIF images in Ubuntu

    Does running ldd on libqtiff.so report any missing dependencies? Make sure you are checking the appropriate Qt installation!
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  5. #5
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    Default Re: Loading TIF images in Ubuntu

    >ldd /usr/lib/x86_64-linux-gnu/qt4/plugins/imageformats/libqtiff.so
    linux-vdso.so.1 => (0x00007fff287c9000)
    libtiff.so.5 => /usr/lib/x86_64-linux-gnu/libtiff.so.5 (0x00007f76882b7000)
    libQtGui.so.4 => /usr/lib/x86_64-linux-gnu/libQtGui.so.4 (0x00007f7687604000)
    libQtCore.so.4 => /usr/lib/x86_64-linux-gnu/libQtCore.so.4 (0x00007f768711e000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f7686e1a000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f7686c04000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f768683e000)
    liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f768661c000)
    libjbig.so.0 => /usr/lib/x86_64-linux-gnu/libjbig.so.0 (0x00007f768640e000)
    libjpeg.so.8 => /usr/lib/x86_64-linux-gnu/libjpeg.so.8 (0x00007f76861b8000)
    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f7685f9f000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f7685c99000)
    libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f7685a5c000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f768583e000)
    libaudio.so.2 => /usr/lib/x86_64-linux-gnu/libaudio.so.2 (0x00007f7685626000)
    libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f768531d000)
    libpng12.so.0 => /lib/x86_64-linux-gnu/libpng12.so.0 (0x00007f76850f7000)
    libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f7684e54000)
    libgobject-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 (0x00007f7684c02000)
    libSM.so.6 => /usr/lib/x86_64-linux-gnu/libSM.so.6 (0x00007f76849fa000)
    libICE.so.6 => /usr/lib/x86_64-linux-gnu/libICE.so.6 (0x00007f76847de000)
    libXi.so.6 => /usr/lib/x86_64-linux-gnu/libXi.so.6 (0x00007f76845cd000)
    libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f76843c3000)
    libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f76841b1000)
    libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f7683e7b000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f7683c77000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f7683a6f000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f768874d000)
    libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f7683844000)
    libXt.so.6 => /usr/lib/x86_64-linux-gnu/libXt.so.6 (0x00007f76835de000)
    libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f76833d9000)
    libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f768319b000)
    libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007f7682f93000)
    libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f7682d8d000)
    libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f7682b6e000)
    libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f7682967000)

    It seems they're all there.
    My simple testprogram (which doesn't print "tif") looks like so:

    Qt Code:
    1. #include <QApplication>
    2. #include <QImageReader>
    3. #include <QList>
    4.  
    5. int main( int argc, char **argv )
    6. {
    7. QApplication app( argc, argv );
    8.  
    9. QList<QByteArray> foo = QImageReader::supportedImageFormats();
    10. foreach (QByteArray b, foo)
    11. {
    12. qDebug("%s", qPrintable(QString(b)));
    13. }
    14.  
    15. exit(0);
    16. }
    To copy to clipboard, switch view to plain text mode 

    How come libqtiff resides in qt4's plugin directory rather than in qt5's ?

    I tried running strace (a program that logs all syscalls with arguments and return values) on the test program above to possibly get more detailed error-info. The string "tif" was nowhere to be found in the log. There was plenty of references to the qt5/plugin directories, but none to the qt4/plugin directories.
    In desperation, I made a symlink to qt4/plugins/imageformats/libqtiff.se in the corresponding qt5 directory, but to no avail.

  6. #6
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    Default Re: Loading TIF images in Ubuntu

    Quote Originally Posted by drhex View Post
    How come libqtiff resides in qt4's plugin directory rather than in qt5's ?
    Apparently you are checking Qt4 installation and not Qt5

    Your friend probably doesn't have the qt5-image-formats-plugins package installed.
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  7. The following user says thank you to wysota for this useful post:

    drhex (12th June 2015)

  8. #7
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    Default Re: Loading TIF images in Ubuntu

    Confirmed. Installing qt5-image-formats-plugins fixed the issue.

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