coordinates

r = [ 1 0 0; 1 1 0; 1 0 0.5];
g = [ 0 1 0; 1 1 0; 0 1 0.5];
b = [0 0 1; 0 1 0; 1 1 0.5];
im = cat(3,r,g,b);
scl = 81;
ims = imresize(im,scl,'nearest');
close all
imshow(ims);

imshow(ims);
xoff = linspace(-0.5,0.5,5);
x = 1+xoff;
y = 2+zeros(size(xoff));
hold on
plot((x-0.5)*scl+0.5,(y-0.5)*scl+0.5,'kx');
hold off

imb = ones(256,256,3);
imb(101:103,101:103,:) = im;
imshow(imb);

xoff = linspace(-0.5,0.5,5);
x = 101+xoff;
y = 102+zeros(size(xoff));
hold on
plot(x,y,'kx');
hold off
% use magnifying tool to zoom into pixel image

Published with MATLAB® R2014a