(QT) C++ 에서 drawtext 할때 폰트의 선명도?가 다른 이유가 뭘까요?

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
	ui->setupUi(this);
 
	QImage image1 = QImage(500, 100, QImage::Format_Mono);
	QPainter painter1(&image1);
	painter1.fillRect(image1.rect(), Qt::white);
	painter1.setFont(QFont("Consolas", 15));
	painter1.drawText(0, 0, 500, 100, Qt::AlignCenter, trUtf8("QImage::Format_Mono"));
	painter1.end();
	ui->label_1->setPixmap(QPixmap::fromImage(image1));
 
	QImage image2 = QImage(500, 100, QImage::Format_RGB32);
	QPainter painter2(&image2);
	painter2.fillRect(image2.rect(), Qt::white);
	painter2.setFont(QFont("Consolas", 15));
	painter2.drawText(0, 0, 500, 100, Qt::AlignCenter, trUtf8("QImage::Format_RGB32"));
	painter2.end();
	ui->label_2->setPixmap(QPixmap::fromImage(image2));
 
	QImage image3 = QImage(500, 100, QImage::Format_ARGB32);
	QPainter painter3(&image3);
	painter3.fillRect(image3.rect(), Qt::white);
	painter3.setFont(QFont("Consolas", 15));
	painter3.drawText(0, 0, 500, 100, Qt::AlignCenter, trUtf8("QImage::Format_ARGB32"));
	painter3.end();
	ui->label_3->setPixmap(QPixmap::fromImage(image3));
 
	QImage image4 = QImage(500, 100, QImage::Format_ARGB32_Premultiplied);
	QPainter painter4(&image4);
	painter4.fillRect(image4.rect(), Qt::white);
	painter4.setFont(QFont("Consolas", 15));
	painter4.drawText(0, 0, 500, 100, Qt::AlignCenter, trUtf8("QImage::Format_ARGB32_Premultiplied"));
	painter4.end();
	ui->label_4->setPixmap(QPixmap::fromImage(image4));
 
}