Wand posterize() function – Python
Last Updated :
08 Jul, 2021
The posterize() function is an inbuilt function in the Python Wand ImageMagick library which is used to reduce color levels per channel.
Syntax:
posterize(level, dither)
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.
Original Image:
Example 1:
Python3
from wand.image import Image
with Image(filename = '../geeksforgeeks.png' ) as image:
with image.clone() as posterize:
posterize.posterize( 2 , 'no' )
posterize.save(filename = 'posterize1.jpg' )
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Output:
Example 2:
Python3
from wand.image import Image
from wand.drawing import Drawing
from wand.color import Color
with Drawing() as draw:
draw.stroke_color = Color( 'black' )
draw.stroke_width = 1
draw.fill_color = Color( 'white' )
draw.circle(( 200 , 200 ),
( 100 , 100 ))
draw.font = '../Helvetica.ttf'
draw.font_size = 30
with Image(width = 400 , height = 400 , background = Color( '# 45ff33' )) as pic:
draw.text( int (pic.width / 3 ), int (pic.height / 2 ), 'GeeksForGeeks !' )
draw(pic)
pic.posterize( 3 , 'floyd_steinberg' )
pic.save(filename = 'posterize2.jpg' )
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Output:
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