魔杖海报化()函数- Python
posterize()函数是Python Wand ImageMagick 库中的一个内置函数,用于降低每个通道的颜色级别。
Syntax:
Parameters: This function accepts three parameters as mentioned above and defined below:
- level: This parameter stores the number of levels per channel.
- dither: This parameter stores the dither method to apply. Some of the available methods are ‘undefined’, ‘no’, ‘riemersma’, ‘floyd_steinberg’.
Return Value: This function returns the Wand ImageMagick object.
原图:
示例 1:
Python3
posterize(level, dither)
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 posterize:
# Invoke posterize function
posterize.posterize(2, 'no')
# Save the image
posterize.save(filename ='posterize1.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 posterize function method
pic.posterize(3, 'floyd_steinberg')
# Save the image
pic.save(filename ='posterize2.jpg')
输出: