$1\mathrm{.}3\mathrm{.}5$ Color$-$Filter an image

The functionality of the color filter is to change the selected color in the picture to the color the user wants. To do that,

first the user has to choose the color by entering the RGB intensity and the threshold of the color the user wants to

modify. Also, the users have to enter the replacement value for each RGB component. All pixels in the picture with

color in the chosen range will be replaced with new color. The following shows the pseudo code for the color filter.

if $(R$ in the range of $[$target$\_$r $-$ threshold, target$\_$r $+$ threshold$])$ and

$($G in the range of $[$target$\_$g $-$ threshold, target$\_$g $+$ threshold$])$ and

$($B in the range of $[$target$\_$b $-$ threshold, target$\_$b $+$ threshold$])$

$R=$ replace$\_$r ;

$G=$ replace$\_$g ;

$B=$ replace$\_$b;

else

keep the current color

You need to define and implement the following function to do this DIP. Note that your program should check boundary

for the new color values, i$.$e$.$ the intensity should be in the range of $0,255.$

$/*$ color filter $*/$

void ColorFilter$($unsigned char R$[$WIDTH$][$HEIGHT$],$

unsigned char G$[$WIDTH$][$HEIGHT$],$

unsigned char B$[$WIDTH$][$HEIGHT$],$

int target$\_$r$,$ int target$\_$g$,$ int target$\_$b$,$ int threshold,

int replace$\_$r$,$ int replace$\_$g$,$ int replace$\_$b$)$;

Figure $3$ shows an example of this operation. In this example, we change the color of the building from red to blue by

setting the target ${?}_r=130,$ target ${?}_g=130,$ target ${?}_b=150,$ threshold $=30,$ replace ${?}_r=0,$ replace $g=255,$ replace $b=$