try
graphicsView
->setRenderHint
(QPainter::SmoothPixmapTransform);
graphicsView->setRenderHint (QPainter::SmoothPixmapTransform);
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and/or
item->setTransformationMode(Qt::SmoothTransformation);
QGraphicsPixmapItem* item = myGraphicsScene->addPixmap( QPixmap::fromImage(image) );
item->setTransformationMode(Qt::SmoothTransformation);
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and/or
graphicsView->setViewport(new QGLWidget)
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