如何获取QPixmap或QImage像素的RGB值 - Qt,PyQt

Question

基于这个答案/sf/answers/53845501/,我在抓取区域中创建了以下代码打印值:

import sys
from PyQt4.QtGui import QPixmap, QApplication
app = QApplication(sys.argv)

# img is QImage type
img = QPixmap.grabWindow(
        QApplication.desktop().winId(),
        x=00,
        y=100,
        height=20,
        width=20,
        ).toImage()

for x in range(0,20):
    for y in range(0,20):
        print( "({},{}) = {}".format( x,y,(img.pixel(x,y)) ) )

但像素显示如下:

(0,0) = 4285163107
(0,1) = 4285163107
(0,2) = 4285163107
(0,3) = 4285163107
(0,4) = 4285163107
(0,5) = 4285163107

如何获得QImage(从QPixmap)像素的RGB值？(最好是在16,24,32屏幕位深度下工作的解决方案)？

示例输出:

(0,0) = (0,0,0)
...
(10,15) = (127,15,256)

(Linux解决方案,用Python3编写)

Answer 1

您看到的问题是从img.pixel()返回的数字实际上是QRgb值,它是一个与格式无关的值.然后,您可以将其转换为正确的表示形式:

import sys
from PyQt4.QtGui import QPixmap, QApplication, QColor
app = QApplication(sys.argv)

# img is QImage type
img = QPixmap.grabWindow(
        QApplication.desktop().winId(),
        x=00,
        y=100,
        height=20,
        width=20,
        ).toImage()

for x in range(0,20):
    for y in range(0,20):
        c = img.pixel(x,y)
        colors = QColor(c).getRgbF()
        print "(%s,%s) = %s" % (x, y, colors)

产量

(0,0) = (0.60784313725490191, 0.6588235294117647, 0.70980392156862748, 1.0)
(0,1) = (0.60784313725490191, 0.6588235294117647, 0.70980392156862748, 1.0)
(0,2) = (0.61176470588235299, 0.6588235294117647, 0.71372549019607845, 1.0)
(0,3) = (0.61176470588235299, 0.66274509803921566, 0.71372549019607845, 1.0)

QImage文档:

可以通过将其坐标传递给pixel()函数来检索像素的颜色.pixel()函数将颜色作为独立于图像格式的QRgb值返回.