I need a new "centered" 2D array (new width(x,col) == new height(y,row))

* For example, if the width(x,col) is 20 pixels greater than the height(y,row), this should return a height x height image, with 10 pixels removed from the left and right edges of the image

* If the number of pixels to be removed is odd, remove 1 fewer pixel from the left or top part.

Code below:

for(var row = 0; row < imageData.length; row++)

for(var col = 0 + value/2; col

{

temp.imageData[row][col] = imageData[row][col];

}

}

How should I change my code in order to reach the requirement of the question ( If the number of pixels to be removed is odd or even) ?