The brightness_contrast() function is an inbuilt function in the Python Wand ImageMagick library which is used to change the brightness and contrast of the image.
Syntax:
brightness_contrast(brightness, contrast, channel)Parameters: This function accepts three parameters as mentioned above and defined below:
- Brightness: This parameter is used to specify the value of brightness which lies in between -100 to 100. Default value is 0.
- Contrast: This parameter is used to specify the value of contrast which lies in between -100 to 100. Default value is 0.
- channel: This parameter is used to specify the value of image channel as undefined, ‘red’, ‘gray’, ‘cyan’, ‘green’, ‘magenta’, ‘blue’, ‘yellow’, ‘alpha’, ‘opacity’, ‘black’, ‘index’, ‘composite_channels’, ‘all_channels, ‘sync_channels’, ‘default_channels’.
Return Value: This function returns the Wand ImageMagick object.
Original Image:
Example 1:
Python3
# Import library from Image from wand.image import Image
# Import the image with Image(filename = '../geeksforgeeks.png' ) as image:
# Clone the image in order to process
with image.clone() as brightness_contrast:
# Invoke brightness_contrast function with brightness as 50, Contrast as 17
# channel as Red
brightness_contrast.brightness_contrast( int ( 50 ), int ( 17 ), 'Red' )
# Save the image
brightness_contrast.save(filename = 'brightness_contrast1.jpg' )
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Output:
Example 2:
Python3
# Import libraries from the wand from wand.image import Image
from wand.drawing import Drawing
from wand.color import Color
with Drawing() as draw: # Set Stroke color the circle to black
draw.stroke_color = Color( 'black' )
# Set Width of the circle to 2
draw.stroke_width = 1
# Set the fill color to 'White (# FFFFFF)'
draw.fill_color = Color( 'white' )
# Invoke Circle function with center at 50, 50 and radius 25
draw.circle(( 200 , 200 ), # Center point
( 100 , 100 )) # Perimeter point
# Set the font style
draw.font = '../Helvetica.ttf'
# Set the font size
draw.font_size = 30
with Image(width = 400 , height = 400 , background = Color( '# 45ff33' )) as pic:
# Set the text and its location
draw.text( int (pic.width / 3 ), int (pic.height / 2 ), 'GeeksForGeeks !' )
# Draw the picture
draw(pic)
# Invoke brightness_contrast function with Brightness as -44, Contrast as 33
# Channel as Red
pic.brightness_contrast( int ( - 44 ), int ( 33 ), 'Red' )
# Save the image
pic.save(filename = 'brightness_contrast2.jpg' )
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Output: