Simple, but complete example showing how to display QImage might look like this: #include <QtGui/QApplication> #include <QLabel> int main(int argc, char *argv[]) { QApplication a(argc, argv); QImage myImage; myImage.load(“test.png”); QLabel myLabel; myLabel.setPixmap(QPixmap::fromImage(myImage)); myLabel.show(); return a.exec(); }
Michal Kottman’s answer is valid and give expected result for some images but it’ll fail on some cases. Here is a solution i found to that problem. QImage imgIn= QImage((uchar*) img.data, img.cols, img.rows, img.step, QImage::Format_RGB888); Difference is adding img.step part. qt won’t complain without it but some images won’t show properly without it. Hope this … Read more
Easilly answered by reading the docs on QImage and QPixmap: The QPixmap class is an off-screen image representation that can be used as a paint device. The QImage class provides a hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device. Edit: Also, from @Dave’s answer: … Read more