Qt 解决png图片转jpg图片透明背景变成黑色的问题

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");}