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Python – color_matrix() function in Wand

  • Last Updated : 08 May, 2020

color_matrix() method allows you to recalculate color values by applying a matrix transform. A matrix can be up to a 6×6 grid where each column maps to a color channel to reference, and each row represents a color channel to effect.red, green, blue, n/a, alpha, and a constant (a.k.a offset) describe the corresponding rows and columns.

Syntax :

wand.image.color_matrix(matrix)

Parameters :

ParameterInput TypeDescription
matrixcollections.abc.Sequence2d list of doubles.

Source Image :

Example 1:






# Import Image from wand.image module
from wand.image import Image
  
# Read image using Image function
with Image(filename ="koala.jpeg") as img:
    matrix = [[0, 0, 1],
              [0, 1, 0],
              [1, 0, 0]]
    # Recalculate color using color_matrix() method
    img.color_matrix(matrix)
    img.save(filename ="cm_koala.jpeg")

Output:

Example 2:




# Import Image from wand.image module
from wand.image import Image
  
# Read image using Image function
with Image(filename ="koala.jpeg") as img:
    matrix = [[0, 1, 0],
              [1, 0, 0],
              [0, 0, 1]]
    # Recalculate color using color_matrix() method
    img.color_matrix(matrix)
    img.save(filename ="cm_koala2.jpeg")

Output:

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