比如我们要获取图片上某个点的颜色，要怎么处理呢？

 

1.获取鼠标坐标

2.截图并将坐标代入途中获取RGB（这里要考虑坐标不在范围）

假如是通过mousePressEvent获取到鼠标坐标

void mousePressEvent(QMouseEvent* e)
{
	QPoint orgPoint;
	orgPoint.setX(e->x());
	orgPoint.setY(e->y());
	
	QDesktopWidget* desk = QApplication::desktop();
	QScreen* screen = QGuiApplication::primaryScreen();
	QPixmap p = screen->grabWindow(desk->winId());
	QImage image = p.toImage();
	QColor color = image.pixelColor(sPos.x(), sPos.y());
	int m_nRed = color.red();
	int m_nGreen = color.green();
	int m_nBlue = color.blue();
}

关于是不是在控件范围内

可以用eventFilter 或者contains