[Qt-interest] Qt-interest Digest, Vol 6, Issue 142

[Tim W]

>One more think.I want to do it on grayscale.I tried to paint the label just
on one pixel but it >shows me a lot of colors.And it is shown in all the
QLabel.Not on a pixel.
>Co

You forgot to set the color table.

Watch out I didn't compile this!

const int width = 500;
const int height = 500;
const int numberOfColors = 256;

QImage img(width, height,QImage::Format_Indexed8);
QVector<QRgb> grayColors(numberOfColors);
for( int i=0 ; i!= numberOfColors ; ++i)
{
     grayColors[i] = qRgb(i,i,i);
}
img.setColorTable( grayColors ) ;

//.... fill the image with the uchar values, note scanLine is way faster
then
for(i=0;i< width;i++)
{
  for(int k=0;k< height;k++)
  {
      img.setPixel(i,k, testMap[i][k]);
  }
}
ui->showMapLabel->setPixmap(QPixmap::fromImage(img));



---
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