Get cmyk values of an image in Qt

   QImage image=QImage("/home/hor/1.jpg").scaled(ui->spinBox->value(),ui->spinBox_2->value());
    int i=0 ;int j =0;

    for(j=0 ; j<image.width();j++)
    { for(i=0;i<image.height();i++)
        {
            QColor color=QColor::fromCmyk(image.pixel(i,j));

    ui->plainTextEdit->appendPlainText(QString("cyan is : ") + QString::number(color.cyan())
                                       + QString("magenta is: ") + QString::number(color.magenta())
                                       + QString("yellow is:") + QString::number(color.yellow())
                                       + QString("black is") +QString::number(color.black()));
}
    }