how to plot in red colour on image

hi.. i have coordinate (x y)on image. i want to plot to red color on that image. how to do this. thanks

Answer 1

[Image Analyst]

Maybe you mean

plot(columnX, rowY, 'r+', 'MarkerSize', 30, 'LineWidth', 3);

If not, describe what you mean by "plot to red".

[mohd]

yes.. many thanks :-)

Answer 2

[Geoff]

You mean you want to change the pixel at x,y to red?

img(y,x,:) = [255 0 0]