Wand function() function in Python

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:

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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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RahulSabharwal

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