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void pngToJpg(QImage pngImage)
{
    QImage jpgImage(pngImage.size(), QImage::Format_ARGB32);
    jpgImage.fill(QColor(Qt::white).rgb());
    QPainter painter(&jpgImage);
    painter.drawImage(0, 0, pngImage);
    jpgImage.save("test.jpg", "JPEG");
}