Wand level() function in Python (original) (raw)

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 :