paint - redistribute each color channel of an image

Calling Sequence:

	img = paint(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:
	
	This function redistributes the rate of the three color channel in an image.First,we get a variable "gray" as we do in function "col2gray".Then recompute each color channel like this: new_red=(red.*gray)/255;


Example:

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