MATLAB: How to create black and white checkerboards with different number of squares

checkerboard

How can I create black and white checkerboard with different number of squares, for example, 2 squares, 4, 8, 16,32….

with the inbuilt checkerboard function, there is grey squares, which is undesirable

Best Answer

The output of checkerboard() contains normalized values where 0 represents black, 1 represents white, and values between represent shades of gray. Just replace the values greater than 0 with 1.

I = checkerboard(20);
I(I>0) = 1;
imshow(I)

Related Solutions

MATLAB: How to create color checkerboard any size

I think you have the right idea with generating a black and white checkerboard first.

If you have a 3x3 array, you have 9 total squares. The pattern of odd/even is [1 0 1 0 1 0 1 0 1]. Now create an array of the two RGB colors: [0 0 0; 1 1 1]. I went with black and white but these could be any colors. Now, index that color array with your odd/even logical vector. With a final reshape and concatenation, you will have a checkerboard image.

N = 3;
colors = [0 0 0; 1 1 1];
inds = 1:N^2;
color_inds = 1+mod(inds,2);
r = colors(color_inds,1);
g = colors(color_inds,2);
b = colors(color_inds,3);
checkers = cat(2,r,g,b);
checkers = reshape(checkers,[N,N,3]);
imagesc(checkers);
axis equal tight;

MATLAB: Coloured checkerboard in Matlab

red = repmat(uint8([1 0 0]), 81,27);
cmap = [0 0 0; 1 0 0];
image(red);
colormap(cmap);

Best Answer

Related Solutions

MATLAB: How to create color checkerboard any size

MATLAB: Coloured checkerboard in Matlab

Related Question