How to reverse foreground color and background color on mask ?

generator
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Hello guys. I have a mask like this :

I want to reverse background color and foreground color for using Morphological Transformations on my image

image description

Before

Background-color:Dark
Foreground color-White

After

Background-color:White
Foreground color-Dark


background[np.where((background > [0,0,0]).all(axis = 2))] =[255,255,255]

I write piece of code on phyton but i can't implement this code on javascript.How can i do with javascript?

Comments

simply invert the Image using bitwise_not

Balaji R ( 2018-02-16 00:28:13 -0600 )edit