Implement Extract Greeness Function

[johnneijzen]

This formula extract greenness of plant

Source:
https://www.researchgate.net/post/Extract_Greenness2

[thepurgeanarchy]

Hello, @johnneijzen. This is how the image looks before and after using the formula to extract the green as stated on this website: https://www.researchgate.net/post/Extract_Greenness2

Before:

After:

[thepurgeanarchy]

@johnneijzen I believe VVI does better the isolation of green