How do I remove transient pixels from rendered image? How to remove this semi-green pixels? I need exactly G = 255 color



I render this image. And if you zoom in, you can see those pixels as shown above. 
My goal is to remove those transient pixels from it, so that this pic have only 4 exact colors. R = 255, G = 255, B 255 and Black.
Solved my problem by setting filter size to 0.00px