img2 = a/3; By dividing the original image matrix 'a' by a value of 3, we can create a new image matrix 'img2' which is similar to the original but with all of the values a third as bright.
The new image matrix stored in the variable 'img2' is created by taking the original image matrix 'a' and dividing all of the values by a third. This results in a new image matrix which is similar to the original, except that the values are a third as bright. This can be used to create a darker or more subtle version of the original image.
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