Color a pixel in python opencv
img[x,y]=[255, 255, 255] is wrong  because opencv img[a,b] is a matrics then you need to change x,y then you must use img[y,x] 
actualy mistake in the order of x,y 
 if you want to change color of point x,y use this >>  img[y,x] = color
I need to color a pixel in an image. I use opencv and python.
I tried img[x,y]=[255 255 255] to color a pixel(x,y) but it wont work :(   
Is there is any mistake in this?
Can you suggest any method?
Thanks in advance.