im_left = im2double(imread('pears.png'));
im_right = im2double(imread('peacock.jpg'));
im_right = imresize(im_right, size(im_left, [1 2]));
f = figure();
ax = axes('Units', 'pixels');
imshow(im_left);
hold(ax);
im_handle = imshow(im_right);
im_handle.AlphaData = zeros(size(im_left, [1 2]));
axes_pos = cumsum(ax.Position([1 3]));
f.WindowButtonMotionFcn = {@cb, size(im_left,2), im_handle, axes_pos};
function cb(obj, ~, im_width, im_handle, axes_pos)
x_pos = obj.CurrentPoint(1);
if x_pos > axes_pos(1) && x_pos < axes_pos(2)
left_cols = floor(floor(x_pos - axes_pos(1))/diff(axes_pos) * im_width);
im_handle.AlphaData(:, 1:left_cols) = 0;
im_handle.AlphaData(:, left_cols+1:end) = 1;
end
end
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