c++ - Qt以最佳质量调整图像大小

Question

任何人都可以帮助我在不使图像像素化的情况下在 qt 中调整图像大小。这是我的代码。结果不如原来的质量..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();