Linux 如何获取 QPixmap 或 QImage 像素的 RGB 值 - Qt、PyQt
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How to get RGB values of QPixmap or QImage pixel - Qt, PyQt
提问by Grzegorz Wierzowiecki
Based on this answer https://stackoverflow.com/a/769221/544721, I've made following code printing values in grabbed region:
基于这个答案https://stackoverflow.com/a/769221/544721，我在抓取区域制作了以下代码打印值：
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)) ) )
But pixels are displayed like this:
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
How to get RGB values of QImage(obtained from QPixmap) pixels ? (preferably, solution working in 16,24,32 screen bit depths) ?
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）？
Example output:
示例输出：
(0,0) = (0,0,0)
...
(10,15) = (127,15,256)
(Solution for Linux, written in Python3)
（Linux 解决方案，用 Python3 编写）
采纳答案by jdi
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:
您看到的问题是从 img.pixel() 返回的数字实际上是一个 QRgb 值，它是一个独立于格式的值。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)
Output
输出
(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)
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.
可以通过将其坐标传递给 pixel() 函数来检索像素的颜色。pixel() 函数将颜色作为与图像格式无关的 QRgb 值返回。
回答by ekhumoro
The color components of the QRgbvalue returned by QImage.pixelcan either be extracted directly, or via a QColorobject:
QRgb返回值的颜色分量QImage.pixel可以直接提取，也可以通过QColor对象提取：
>>> from PyQt4 import QtGui
>>> rgb = 4285163107
>>> QtGui.qRed(rgb), QtGui.qGreen(rgb), QtGui.qBlue(rgb)
(106, 102, 99)
>>> QtGui.QColor(rgb).getRgb()[:-1]
(106, 102, 99)
