Best colors/models/cs:s settings For A Pixel Bot

Hello there, I have coded a java pixel bot a long time ago. I never did anything with it. Anyway, it gets really good speed(Or so I think), 5ms per 50x50 pixel scan. But, the problem is that I can never get the color detection right. I have blue/red models already. Basically, if the enemy is too far away they get foggy and the color changes again, if I try to set-up a range the pixel bot starts detecting random shit. So, what's the best colors/models/cs:s settings for a pixel bot?

java coded? nice stuff