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Wand function() function in Python
  • Difficulty Level : Easy
  • Last Updated : 10 May, 2020

function() function is similar to evaluate function. In function() function pixel channels can be manipulated by applis a multi-argument function to pixel channels.
Following are the list of FUNCTION_TYPES in Wand:

  • ‘undefined’
  • ‘arcsin’
  • ‘arctan’
  • ‘polynomial’
  • ‘sinusoid’

Syntax :

wand.image.function(function, arguments, channel)

Parameters :

Parameter Input Type Description
function collections.abc.Sequence a sequence of doubles to apply against function
arguments numbers.Real Number to calculate with operator
channel basestring Optional channel to apply operation on.

Example 1:

Source Image:



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# Import Image from wand.image module
from wand.image import Image
  
frequency = 3
phase_shift = -90
amplitude = 0.2
bias = 0.7
  
# Read image using Image function
with Image(filename ="koala.jpeg") as img:
    # appying sinusoid FUCTION_TYPE
    img.function('sinusoid', [frequency, phase_shift, amplitude, bias])
    img.save(filename ="kl-functioned.jpeg")

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Output :

Example 2:

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# Import Image from wand.image module
from wand.image import Image
  
frequency = 3
phase_shift = -90
amplitude = 0.2
bias = 0.7
  
# Read image using Image function
with Image(filename ="road.jpeg") as img:
    # appying sinusoid FUCTION_TYPE
    img.function('polynomial', [frequency, phase_shift, amplitude, bias])
    img.save(filename ="rd-functioned.jpeg")

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Output :

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