MATLAB: How to draw/change the color of 1 pixel in an image

Image Processing Toolboxpixel

I want to take an image into matlab and edit it by changing one pixel at a set of coordinates to a different color so as to identify points of interest on the image.
The plot function won't work as I am creating a video with a series of frames and implay.
Any help much appreciated

Best Answer

rgbImage(row, column, :) = [r, g, b]; % r, g, b are uint8 values.
imshow(rgbImage);
drawnow; % Force it to paint right now
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