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
# Import Image from wand.image modulefrom wand.image import Imagefrequency = 3phase_shift = -90amplitude = 0.2bias = 0.7# Read image using Image functionwith Image(filename ="koala.jpeg") as img: # applying sinusoid FUNCTION_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 modulefrom wand.image import Imagefrequency = 3phase_shift = -90amplitude = 0.2bias = 0.7# Read image using Image functionwith Image(filename ="road.jpeg") as img: # applying sinusoid FUNCTION_TYPE img.function('polynomial', [frequency, phase_shift, amplitude, bias]) img.save(filename ="rd-functioned.jpeg") |
Output :
