Qt以最佳质量调整图像大小

Question

任何人都可以帮我调整qt中的图像大小而不会使图像像素化。 这是我的代码。结果不如原始质量好。谢谢......

QImage img(name);
QPixmap pixmap;
pixmap = pixmap.fromImage(img.scaled(width,height,Qt::IgnoreAspectRatio,Qt::FastTransformation));
QFile file(folder+"/"+name);
file.open(QIODevice::WriteOnly);
pixmap.save(&file, "jpeg",100);
file.close();

Answer 1

您必须将Qt::SmoothTransformation转换模式传递给scaled函数，例如：

QImage img(name);
QPixmap pixmap;
pixmap = pixmap.fromImage(img.scaled(width,height,Qt::IgnoreAspectRatio,Qt::SmoothTransformation));
QFile file(folder+"/"+name);
file.open(QIODevice::WriteOnly);
pixmap.save(&file, "jpeg",100);
file.close();