get QImage object from buffer

[Sheng]

my code:

//change 16 bit gray scale to 8 bit gray scale
   for(int i=0;i<IMAGE_WIDTH*IMAGE_HEIGHT;i++)
           imageBuffer[i]= (*((uint16_t *)(imageBuffer+2*i)))/4;
 
//get QImage object from the buffer, this might be wrong
        QImage image(imageBuffer,IMAGE_WIDTH,IMAGE_HEIGHT,QImage::Format_Indexed8);
 
//rescale the image
        QImage smallImg=image.scaled(600,300);
 
//use QLabel object to show the image
        labelImage->setPixmap(QPixmap::fromImage(smallImg));

//change 16 bit gray scale to 8 bit gray scale
   for(int i=0;i<IMAGE_WIDTH*IMAGE_HEIGHT;i++)
           imageBuffer[i]= (*((uint16_t *)(imageBuffer+2*i)))/4;

//get QImage object from the buffer, this might be wrong
        QImage image(imageBuffer,IMAGE_WIDTH,IMAGE_HEIGHT,QImage::Format_Indexed8);

//rescale the image
        QImage smallImg=image.scaled(600,300);

//use QLabel object to show the image
        labelImage->setPixmap(QPixmap::fromImage(smallImg));

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[bhamadicharef]

You could also use a lookup table to encode you linear 16bit data
Into any of your chosen format ... SetPixmap is taking so much
Time on my embeded system at large resolution ... Any idea
How to improve this ??