Shining LEDs make noise while image processing

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I'm using Aforge Framework. trying to seperate three kind of LEDs (red,green,yellow close to each other every Led). When i looked them i se everything is good. Red is Red, Green is green, yellow is yellow. But when i looked them with Cam, i see only shining White. I have tried many kind of filter (ofcourse HSL, Gamma, Brightness, Contrast, Grayscale etc.) and mix of them. But none of them gave me the results thet i have expected. %5 of Red i can only see in 30x30 piksel of box when red LED is active. is there any other way to make LEDS color significant?

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