Qt以最佳质量调整图像大小 [英] Qt resize image with best quality

问题描述

任何人都可以帮助我在qt中调整图像大小而不会使图像像素化. 这是我的代码.结果不如原来的质量..谢谢...

Can anyone help me resize an image in qt without making the image pixelated. Here's my code. the result is not as good as the original quality..thanks...

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();

推荐答案

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

You have to pass Qt::SmoothTransformation transformation mode to the scaled function like:

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();

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