如何获取QPixmap或QImage像素的RGB值 - Qt，PyQt [英] How to get RGB values of QPixmap or QImage pixel - Qt, PyQt

问题描述

根据这个答案 https://stackoverflow.com/a/769221/544721 ，我做了以下抓取区域中的代码打印值：

Based on this answer https://stackoverflow.com/a/769221/544721 , I've made following code printing values in grabbed region:

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

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

How to get RGB values of QImage (obtained from QPixmap) pixels ? (preferably, solution working in 16,24,32 screen bit depths) ?

示例输出：

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

（Linux解决方案，用Python3编写）

(Solution for Linux, written in Python3)

推荐答案

您看到的问题是从img.pixel（）返回的数字实际上是一个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：

The issue you are seeing is that the number being returned from img.pixel() is actually a QRgb value that is a format independent value. You can then convert it into the proper representation as such:

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)

输出

Output

(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
来检索像素的颜色pixel（）函数。 pixel（）函数将颜色返回为图像格式独立的QRgb
值。

The color of a pixel can be retrieved by passing its coordinates to the pixel() function. The pixel() function returns the color as a QRgb value indepedent of the image's format.

这篇关于如何获取QPixmap或QImage像素的RGB值 - Qt，PyQt的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！