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PyQt5 Label – Accessing the strength of the Color Effect
  • Last Updated : 10 May, 2020

In this article we will see how we can access the strength of the color effect of the label by default there is no color effect to the label although we can create color effect for the label. Color effect is not like background color it is more like of colored filters we use on pictures. Strength is the intensity of the color effect.

In order to do this we use strength method.

Syntax : color_effect.strength()
Here color_effect is the QGraphicsColorizeEffect object

Argument : It takes no argument

Return : It returns float value



Note : Strength value ranges from 0 to 1.0

Below is the implementation




# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # making background color light yellow
        self.setStyleSheet("background : lightyellow;")
  
        # setting title
        self.setWindowTitle("Python ")
  
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for widgets
    def UiComponents(self):
  
        # creating label
        label = QLabel("Label", self)
  
        # setting geometry to the label
        label.setGeometry(200, 100, 150, 60)
  
        # setting alignment to the label
        label.setAlignment(Qt.AlignCenter)
  
        # setting font
        label.setFont(QFont('Arial', 15))
  
        # creating a color effect
        color_effect = QGraphicsColorizeEffect()
  
        # setting color to color effect
        color_effect.setColor(Qt.darkRed)
  
        # setting strength
        color_effect.setStrength(0.5)
  
        # adding color effect to the label
        label.setGraphicsEffect(color_effect)
  
        # creating result label
        result = QLabel(self)
  
        # setting geometry to the result
        result.setGeometry(200, 200, 300, 30)
  
        # getting the strength
        strength = color_effect.strength()
  
        # setting text to result label
        result.setText("Color : " + str(strength))
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

Output :

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