My mode to displaying QIcons

[Borland]

There is no QGuessWhatIWantAndDoIt class in Qt.

Sometimes I regret that there is no such class

This code decrease saturation for each pixel:

QImage img;
img = pixmap.toImage();
int w = img.width();
int h = img.height();
for (int y = 0; y < h; ++y)
{
	for(int x = 0; x < w; ++x)
	{
		QColor pixel = img.pixel(x, y);
		pixel.setHsl(pixel.hue(), 30, pixel.lightness(), pixel.alpha());
		img.setPixel(x, y, pixel.rgba());
	}
}
//return QPixmap::fromImage(img, Qt::AutoColor)

QImage img;
img = pixmap.toImage();
int w = img.width();
int h = img.height();
for (int y = 0; y < h; ++y)
{
	for(int x = 0; x < w; ++x)
	{
		QColor pixel = img.pixel(x, y);
		pixel.setHsl(pixel.hue(), 30, pixel.lightness(), pixel.alpha());
		img.setPixel(x, y, pixel.rgba());
	}
}
//return QPixmap::fromImage(img, Qt::AutoColor)

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What do you think, It is not too time-consuming process?