跪求+跪求：png格式图片太大时，QLabel无法显示图片 [复制链接]

png格式图片大小为455k，尺寸是3134*6444，QLabel无法按原始尺寸显示该图片，
大小28.6k时，尺寸是1344*165的png可以显示。

代码 如下  qt 3.3.5库
 QPixmap *pixmap = new QPixmap(filename);    filename为图片路径
bool success = pixmap->load(filename, 0);
 if(success)
 {
            label->setPixmap(*pixmap);
...........................
}

QPixmap::QPixmap ( const QString & fileName, const char * format = 0, Qt::ImageConversionFlags  flags = Qt::AutoColor )

If the image needs to be modified to fit in a lower-resolution result (e.g. converting from 32-bit to 8-bit), use the flags to control the conversion.
http://doc.trolltech.com/4.6/qt.html#ImageConversionFlag-enum

刚试过这个：QPixmap *pixmap= new QPixmap(filename,0,Qt::AutoColor);
一样打不开

flags = Qt::AutoColor is default setting.  You did not change anything.

Try other settings. for example:
    QPixmap *pixmap= new QPixmap(filename,0,Qt::ThresholdDither)

Good luck.