how I can get color of a point?

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how I can get color of a point?

JANEAUSTEN
dear teacher,
I know when i use the "point" in the tool, I can know the  (x,y) color from the "value" which is show in the imageJ; how can i show get from the macro? for example, i can get(x,y)= (45,200)color: (r,g,b), and judge r>100, i set color as i like. there are some macro function do this ?
Best wishes,
                                                                                                                              ChenYanpei