color_balance - increases or decreases the brightness of RGB color channels in the image independently

Calling Sequence:

	img = color_balance(im,red,green,blue)
	
Parmeters:
	
	im: matrix of an input image
	red: set contribution to R channel
	green: set contribution to G channel
	blue: set contribution to B channel
	img: output image matrix
	
Description:
	
	some colors can be highlighted, while other are suppressed or remain untouched.Color balance may be quite handful, e.g., when viewing an image on a display with different color calibration than the calibration of the device the image was acquired with. Another field of usage is art photography and video processing, as different colors possess the ability to evoke specific emotions.

Example:

	im = imread("lena.png");
	img = color_balance(im,255,0,0);