# Wand function() function in Python

• Difficulty Level : Easy
• Last Updated : 16 Oct, 2021

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

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

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Syntax :

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

Parameters :

Example 1:
Source Image: ## Python3

 `# 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:``    ``# applying sinusoid FUCTION_TYPE``    ``img.function(``'sinusoid'``, [frequency, phase_shift, amplitude, bias])``    ``img.save(filename ``=``"kl-functioned.jpeg"``)`

Output : Example 2:
Source Image: ## Python3

 `# 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:``    ``# applying sinusoid FUCTION_TYPE``    ``img.function(``'polynomial'``, [frequency, phase_shift, amplitude, bias])``    ``img.save(filename ``=``"rd-functioned.jpeg"``)`

Output : My Personal Notes arrow_drop_up