Problem with pixelIndex in QImage

[danilodsp]

I do not understand this problem.
I normally use a QImage, but now this happening a problem that I can not see.

In my .h:

QImage *mascara; // Máscara para filtro

QImage *mascara; // Máscara para filtro

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In my .cpp:

mascara = new QImage(2,2,QImage::Format_Indexed8);
 
    mascara->setPixel(0,0,5);
    mascara->setPixel(0,1,5);
    mascara->setPixel(1,0,5);
    mascara->setPixel(1,1,5);
    QString test;
    test.setNum(mascara->pixelIndex(0,0));
    ui->console->appendPlainText(test);

mascara = new QImage(2,2,QImage::Format_Indexed8);

    mascara->setPixel(0,0,5);
    mascara->setPixel(0,1,5);
    mascara->setPixel(1,0,5);
    mascara->setPixel(1,1,5);
    QString test;
    test.setNum(mascara->pixelIndex(0,0));
    ui->console->appendPlainText(test);

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I do not see the pixel that I placed. In test no have the value 5.