How can I to do bwlabel for RGB image

clc ; clear all ;

imgs = imread('hand.jpg') ;

img = double (imgs) ;

[ii , jj , kk] = size(img) ;

img1 = zeros(ii,jj);

img2 = zeros(ii,jj);

imghsv = rgb2hsv(img) ;

img1(imghsv(:,:,1)<0.1) = 1 ;

img2(imghsv(:,:,1)>0) = 1 ;

img3 = img1 & img2 ;

imgreo = imerode(img3,ones(3)) ;

imgdil = imdilate(imgreo,ones(5)) ;

leb = bwlabel(imgdil) ;

im1 = (leb==1) ;

im2 = (leb==2) ;

subplot(2,2,1);imshow(imgs);

subplot(2,2,2);imshow(imgdil);

subplot(2,2,3);imshow(im1);

subplot(2,2,4);imshow(im2);

I can do bwlabel for Binarization image,but I don't know how to do RGB image？

I want to do the bwlabel for my top left image(imgs = imread('hand.jpg') ;), how can I do ？

[DGM]

bwlabel() only works on binary images, hence the prefix 'bw'. That aside, what would the results of such an operation look like? bwlabel returns a map of the connected components in a binary image. What is a connected component of an RGB image? Is it a non-white region? Is it a region whose color points lie within a rectangular prism in 3D space? What about an ellipsoid? Is there any answer to that question which does not describe the process of binarization of the image?