Wand line() function in Python

Wand level() function in Python

Last Updated : 10 Mar, 2023

level() function controls the black and white boundaries of an image. Similar to the gamma() method, mid-point levels can be adjusted with the gamma keyword argument. The black and white point arguments are expecting values between 0.0 & 1.0 which represent percentages.

Syntax :
wand.image.level(operator, value, channel)
Parameters :

Parameter Input Type Description
black numbers.Real Black point, as a percentage of the system’s quantum range. Defaults to 0..
white numbers.Real White point, as a percentage of the system’s quantum range. Defaults to 1.0.

gamma numbers.Real Optional gamma adjustment. Values > 1.0 lighten the image’s midtones while values < 1.0 darken them.

channel basestring The channel type.

Example 1:
Source Image:

Python3

# Import Image from wand.image module
from wand.image import Image

# Read image using Image function
with Image(filename ="koala.jpeg") as img:
    img.level(0.2, 0.9, gamma = 1.1)
    img.save(filename ="kl-level.jpeg")

Output :

Example 2:
Increasing black and white value to 0.5 and 0.7.

Python3

# Import Image from wand.image module
from wand.image import Image

# Read image using Image function
with Image(filename ="koala.jpeg") as img:
    img.level(0.5, 0.7, gamma = 1.1)
    img.save(filename ="kl-level2.jpeg")

Output :

Wand line() function in Python

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RahulSabharwal

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