scanning images

[wysota]

JPG files might need a plugin to work. If you installed Qt from binary packages, you probably need to install some other packages as well.

If one image doesn't work, try another - especially PNG, support for them is embedded into Qt itself so it should always work. The device error is most likely caused by some permissions problem - check if you have read permissions for the file. You can test with a simple program:

QFile file("/home/..../...jpg");
if(file.isReadable()) qDebug() << "readable";
qDebug() << file.open(QFile::ReadOnly);

QFile file("/home/..../...jpg");
if(file.isReadable()) qDebug() << "readable";
qDebug() << file.open(QFile::ReadOnly);

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You should get "readable" and "true".