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’
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:
Python3
from wand.image import Image
frequency = 3
phase_shift = -90
amplitude = 0.2
bias = 0.7
with Image(filename ="koala.jpeg") as img:
img.function('sinusoid', [frequency, phase_shift, amplitude, bias])
img.save(filename ="kl-functioned.jpeg")
|
Output :
Example 2:
Source Image:
Python3
from wand.image import Image
frequency = 3
phase_shift = -90
amplitude = 0.2
bias = 0.7
with Image(filename ="road.jpeg") as img:
img.function('polynomial', [frequency, phase_shift, amplitude, bias])
img.save(filename ="rd-functioned.jpeg")
|
Output :
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Last Updated :
27 Feb, 2023
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