Wand - blur() function in Python

Python - evaluate() function in Wand

Last Updated : 10 Mar, 2023

In evaluate() function pixel channels can be manipulated by applying an arithmetic, relational, or logical expression.

Syntax :
wand.image.evaluate(operator, value, channel)
Parameters :

Parameter Input Type Description
operator basestring Type of operation to calculate.
value numbers.Real Number to calculate with operator

channel basestring Optional channel to apply operation on.

Following are the list of EVALUATE_OPS in Wand:

EVALUATE_OPS	Description
'undefined'	it is the default EVALUATE_OPS.
'abs'	create an abstract evaluation.
'add'	add evaluation.
'addmodulus'	add modulus evaluation.
'and'	and evaluation.
'cosine'	evaluate from cosine function.
'gaussiannoise'	Add gaussian noise evaluation
'impulsenoise'	Add impulse noise evaluation
'laplaciannoise'	Add laplace noise evaluation
'leftshift'	bitwise leftshift
'max'	max evaluation
'mean'	mean evaluation added.
'median'	median evaluation added.
'multiplicativenoise'	Add multiplicative noise evaluation
'multiply'	multiply image evaluation
'or'	or evaluation
'poissonnoise'	Add poisson noise evaluation
'pow'	Add powe evaluation
'rightshift'	bitwise right shift
'set'	Add set evaluation
'sine'	Add sine function evaluation
'threshold'	Add threshold evaluation with particular threshold point.
'thresholdblack'	Add evaluation while threshold is black.
'thresholdwhite'	Add evaluation while threshold is white.
'uniformnoise'	Add uniform noise evaluation

Source Image:

Code Example 1:

Python3

# Import Image from wand.image module
from wand.image import Image

# Read image using evaluate function
with Image(filename ="koala.jpeg") as img:
    img.evaluate(operator ='rightshift', value = 1, channel ='blue')
    img.save(filename ="kl-enhanced.jpeg")

Output Image:

Code Example 2:

Python3

# Import Image from wand.image module
from wand.image import Image

# Read image using evaluate function
with Image(filename ="koala.jpeg") as img:
    img.evaluate(operator ='leftshift', value = 1, channel ='red')
    img.save(filename ="kl-enhanced2.jpeg")

Output Image:

Wand - blur() function in Python

R

RahulSabharwal

Improve

Article Tags :

Practice Tags :

python

Similar Reads

Wand alpha() function in Python

The alpha() function is identical to the wand color() function. Similar to color() function, alpha() function draws a color on the image using current fill color, starting at specified position & method. Uses same arguments as color() method. Syntax: wand.drawing.alpha(x, y, method) Parameters :

Wand - blur() function in Python

Blurring Image means making an image fuzzy or hazy. A blur image is indefinite and it is unable to see an image clearly. Blur is of many types, like - Adaptive blur, Gaussian blur, Selective Blur etc. In order to blur an image we use blur() function. blur() function takes three arguments. Example :

Wand enhance() function in Python

Similar to despeckle() function this function also reduces noise of the image. enhance() function return an image with reduced noise of an image by applying an auto-filter. Syntax : wand.image.enhance() Parameters : No parameters in enhance() function Source Image: Example 1: Python3 # Import Image

Wand ellipse() function in Python

ellipse() function is used to draw an ellipse on the image. Just similar to drawing circle the ellipse() function requires two pairs of point that is, origin and a pair of (x, y) radius of the ellipse. To draw a partial ellipse, provide a pair of starting & ending degrees as the third parameter.

Wand arc() function in Python

arc() is a function present in wand.drawing module. arc() function draws an arc in the image. Youâ€™ll need to define three pairs of (x, y) coordinates. First & second pair of coordinates will be the minimum bounding rectangle, and the last pair define the starting & ending degree. Syntax : wa

Wand circle() function in Python

The circle() function is another Drawing function in Wand. This method is used to draw a circle in the image. It requires only two arguments that are origin and perimeter of the circle. Syntax: wand.drawing.circle(origin, perimeter)Â Parameters : ParameterInput TypeDescriptionorigin(collections.abc.

Wand bezier() function in Python

The bezier() is another Drawing function in Wand. This method is used to draw a bezier curve. It requires four points to determine a bezier curve. Extreme points define the start and end of the curve while in between two points are used to control the curve. Syntax: wand.drawing.bezier(points) Param

Wand flip() function in Python

In this article we will learn what is flip() function. Basically this function returns a flipped image. Flip effect flips an image upside-down or creates an vertical reflection of image. No arguments are needed in this function. Syntax : wand.image.flip()Parameters : No Parameters in flip() function

Wand flop() function in Python

In this article we will learn what is flop() function. Basically this function returns a flipped image. Flop effect flops an image upside-down or creates an vertical reflection of image. No arguments are needed in this function. Syntax : wand.image.flop()Parameters : No Parameters in flop() function

Wand clahe() function - Python

The clahe() function is an inbuilt function in the Python Wand ImageMagick library which is used to contrast limited adaptive histogram equalization. Syntax: clahe(width, height, number_bins, clip_limit) Parameters: This function accepts four parameters as mentioned above and defined below: width: T