converting image into monochrome format

[aj2903]

hii...
i'm able to create .bmp image.
But the image is not getting converted into Monochrome.

I have tried wth following code :

QPixmap bmp(100,50);
    QPainter p(&bmp);
    p.setRenderHint(QPainter::Antialiasing,blnVar);
    p.setPen(Qt::white);
    p.drawText(10,20,"AJ");
    bmp.save("d:\\Test.bmp","bmp",-1);
 
    imgTemp = bmp.toImage();
 
    imgTemp.convertToFormat(QImage::Format_Mono,Qt::MonoOnly);
    imgTemp.save("d:\\tempMono.bmp","bmp",-1);

QPixmap bmp(100,50);
    QPainter p(&bmp);
    p.setRenderHint(QPainter::Antialiasing,blnVar);
    p.setPen(Qt::white);
    p.drawText(10,20,"AJ");
    bmp.save("d:\\Test.bmp","bmp",-1);

    imgTemp = bmp.toImage();

    imgTemp.convertToFormat(QImage::Format_Mono,Qt::MonoOnly);
    imgTemp.save("d:\\tempMono.bmp","bmp",-1);

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After executing this code, 2 bmp files are created but both are 32 bit.
How to convert it to monochrome format.
Can somebody help me to solve this ?