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Found this link how to enhance the red, green and blue color within an image? altering the saturation channel of the HSV colour space

I even need to reduce the brightness so I even had to alter the value channel of the HSV colourspace

Code

hsvImg = cv2.cvtColor(image,cv2.COLOR_BGR2HSV)

#multiple by a factor to change the saturation
hsvImg[...,1] = hsvImg[...,1]*1.4

#multiple by a factor of less than 1 to reduce the brightness 
hsvImg[...,2] = hsvImg[...,2]*0.6

image=cv2.cvtColor(hsvImg,cv2.COLOR_HSV2BGR)