魔杖亮度对比度()函数- Python
Brightness_contrast()函数是Python Wand ImageMagick 库中的一个内置函数,用于更改图像的亮度和对比度。
Syntax:
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.
原图:
示例 1:
Python3
brightness_contrast(brightness, contrast, channel)
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')
输出:
示例 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')
输出: