qpixmap 灰度化
时间: 2023-09-12 22:11:38 浏览: 266
要将QPixmap灰度化,可以使用以下方法之一:
方法一:
将QImage转换为灰度图像,然后再将其转换为QPixmap,最后将QPixmap显示出来。具体代码如下:
```
QImage image2 = pixmap.toImage().convertToFormat(QImage::Format_Grayscale8);
QPixmap gray_pixmap = QPixmap::fromImage(image2);
label->setPixmap(gray_pixmap);
```
方法二:
直接对QPixmap中的像素进行操作,将每个像素的RGB分量调整为相同的数值,从而实现灰度化。具体代码如下:
```
QPixmap gray_pixmap = pixmap;
QImage image = gray_pixmap.toImage();
for (int y = 0; y < image.height(); y++) {
for (int x = 0; x < image.width(); x++) {
QRgb pixel = image.pixel(x, y);
int gray = qGray(pixel);
image.setPixel(x, y, qRgb(gray, gray, gray));
}
}
gray_pixmap.convertFromImage(image);
label->setPixmap(gray_pixmap);
```
这两种方法都可以将QPixmap灰度化,并将结果显示在label上。方法一是先将QPixmap转换为QImage,然后对QImage进行灰度转换,最后再将灰度图像转换回QPixmap。方法二则直接对QPixmap中的像素进行操作,将RGB分量调整为相同的值,从而实现灰度化。两种方法中的label都是用来显示灰度化后的图像的。
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