我正在尝试在我的主Qt UI中的QLabel上更新一个QPixmap。以下插槽被调用以使用“newImage”变量QImage(因为它来自不同的线程)来完成此操作。使用convertFromImage将QImage转换为someImage(我也尝试过::fromImage)。如果我只是将QImage“newImage”保存到文件中,我会得到一个绿色矩形和我之前用OpenCV绘制的红色文本,但是,如果我保存转换后的pixmap或显示转换后的pixmap,则会丢失图像中矩形和文本的颜色,但保留框架本身的颜色。我在下面发布了2张图片,以演示我传递给此插槽的QImage与在pixmap中显示在UI中的差异。我不知道如何使pixmap显示带有颜色的矩形和文本!我做错了什么?谢谢!
void MainWindow::updateImage(QImage newImage, double timeElapsed) {
QImage someImage = newImage.convertToFormat(QImage::Format_RGB888);
// Get pixmap from data
m_NewPixMap.convertFromImage(someImage,Qt::ColorOnly); // Tried various ones of these
// Debug status
// qDebug() << "Pixmap received by MainWindow and elapsed time is: " << timeElapsed << " ( Image size is: " << newImage.byteCount() << " )";
// qDebug() << "Pixmap is null? " << m_NewPixMap.isNull();
// Update the label
float hz = 1000.0f / timeElapsed;
QString status;
status.sprintf("FrameRate (Hz) = %.02f (%.0f ms)", hz, timeElapsed);
// Update status label
m_StatusLabel->setText(status);
// Update the main view
m_Label->setPixmap(m_NewPixMap);
repaint();
//qDebug() << "Saving QImage now...";
QFile file(QString("output_detected_images/detected_image_%1.png").arg(m_Counter));
file.open(QIODevice::WriteOnly);
bool savedSuccessfully = newImage.save(&file,"PNG"); // This gives proper color in image
//bool savedSuccessfully = m_NewPixMap.save(&file, "PNG"); // THIS GIVES A BLACK IMAGE
qDebug() << "Done saving QPixmap... " << savedSuccessfully;
}
m_NewPixMap = QPixmap::fromImage(newImage);
不起作用吗? - vahancho