function im=chessboard(V,R,C) % V – размер в px, R & C – высота и ширина.
im=zeros(R,C);
for c=1:C
del = R/4 - 2;
if del > 0
difference0 = (V/2)/(fix(R/4));
if mod(R,4) == 0
difference1 = (V/2)/fix((R/4)-1);
else
difference1 = difference0;
end
end
if mod(c,2)~=0
pix = 0;
for r = 1:2:R/2
im(r,c)=pix;
pix = pix + difference0;
end

if mod(R,4) == 0
start = R/2+2;
else
start = R/2+1;
end
for r = start:2:R
pix = pix - difference0;
im(r,c)=pix;
end


pix = V;
for r = 2:2:R/2
im(r,c)=pix;
pix = pix - difference1;
end

if mod(R,4) == 0
start = R/2+1;
else
start = R/2+2;
end
for r = start:2:R
pix = pix + difference1;
im(r,c)=pix;
end


else
pix = V;
for r = 1:2:R/2+1
im(r,c)=pix;
pix = pix - difference0;
end

if mod(R,4) == 0
start = R/2+2;
else
start = R/2+1;
end
for r = start:2:R
pix = pix + difference0;
im(r,c)=pix;
end


pix = 0;
for r = 2:2:R/2
im(r,c)=pix;
pix = pix + difference1;
end

if mod(R,4) == 0
start = R/2+1;
else
start = R/2+2;
end
for r = start:2:R
pix = pix - difference1;
im(r,c)=pix;
end
end
end
im=uint8(im);
imshow(im);
end