Image Convert in RGB and Separate (Red, Green, Blue)

                                  What is RGB?

RGB color space or RGB color system, constructs all the colors from the combination of the Red,Green and Blue colors.

The red, green and blue use 8 bits each, which have integer values from 0 to 255. This makes 256*256*256=16777216 possible colors.

RGB ≡ Red, Green, Blue

Each pixel displays colors this way, by combination of red, green and blue Channels 

Image Convert in RGB and Separate

%# Initialization:

img = imread('3.jpg');     %# img is variable and imread is function to read image 

size(img)                  %# size is a function it is show the size of variable

ans   2448        3264           3

R=img;

B=img;

G=img;

G(:,:,1:2:3)=0;  %# In this function : mean all row column and color channel 1,2,3 is equal to 0 so then that will show just Green Channel of the image  

R(:,:,2:3)=0;    %# it is use for Red Channel of the image  

B(:,:,1:2)=0;    %# it is use for Blue Channel of the image  

imshow(R)

imshow(B)

imshow(G)

crop = R(1:1108,1:1629,:); %# in which we select some Red Channel area of the image 

crop1 = B (1:1108,1629:3264,:);

crop2 = G(1108:2448,1:1629,:);

img(1:1108,1:1629,:)=crop ; %# here we replace our selected Red Channel area with our original image  

img(1:1108,1629:3264,:)=crop1;

img(1108:2448,1:1629,:)= crop2;

imshow(img)