Wand transform() function in Python

Last Updated : 12 Jun, 2020

In order to resize and crop an image at the same time transform() function is used in wand. First crop operation is performed and then resize operation.

Syntax : wand.image.transform(crop='', resize='') Parameters :

Parameter Input Type Description

crop basestring A geometry string defining a subregion of the image to crop to

resize basestring A geometry string defining the final size of the image

Parameter	Input Type	Description
crop	basestring	A geometry string defining a subregion of the image to crop to
resize	basestring	A geometry string defining the final size of the image

Input Image:

Example #1: Let us take an image crop it in dimensions 200x200 and then rescale it to 400x400 pixels.

Python3 1==

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

# Import display to display final image
from wand.display import display

# Read image using Image function
with Image(filename ='koala.jpeg') as img:

    # using transform() function
    img.transform('200x200', '200 %')

    # Saving image
    img.save(filename ='transform.jpeg')

    # display image
    display(img)

Output:

Example #2: Let us take an image crop 50 % of all four corners.

Python3 1==

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

# Import display to display final image
from wand.display import display

# Read image using Image function
with Image(filename ='koala.jpeg') as img:

    # using transform() function
    img.transform('50 %')

    # Saving image
    img.save(filename ='transform1.jpeg')

    # display image
    display(img)

Output:

Example #3: Scale height of source image to 200px and preserve aspect ratio.

Python3 1==

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

# Import display to display final image
from wand.display import display

# Read image using Image function
with Image(filename ='koala.jpeg') as img:

    # using transform() function
    img.transform(resize ='x200')

    # Saving image
    img.save(filename ='transform3.jpeg')

    # display image
    display(img)