MATLAB: Why is the image blurred after rgb to hsi conversion

color spaceImage Processing Toolboxrgb to hsi

Hi, Im trying to convert a rgb image to hsi and i found a piece of code that's supposed to do that but the result is always sort of blurred. I tried other codes as well but same results. Here is the code:
A=imread('image\sat2.jpg');
figure,imshow(A);title('RGB Image');
%Represent the RGB image in [0 1] range
I=double(A)/255;
R=I(:,:,1);
G=I(:,:,2);
B=I(:,:,3);
%Hue
numi=1/2*((R-G)+(R-B));
denom=((R-G).^2+((R-B).*(G-B))).^0.5;
%To avoid divide by zero exception add a small number in the denominator
H=acosd(numi./(denom+0.000001));
%If B>G then H= 360-Theta
H(B>G)=360-H(B>G);
%Normalize to the range [0 1]
H=H/360;
%Saturation
S=1- (3./(sum(I,3)+0.000001)).*min(I,[],3);
%Intensity
I=sum(I,3)./3;
%HSI
HSI=zeros(size(A));
HSI(:,:,1)=H;
HSI(:,:,2)=S;
HSI(:,:,3)=I;
figure,imshow(HSI);title('HSI Image');
figure,imshow(H);title('hue component');

Best Answer

Because you are inputting an HSI image. The imshow documentation clearly states that it works with greyscale, binary, and RGB images: "Input image, specified as a grayscale, RGB, or binary image." or with indexed images: "Indexed image, specified as a 2-D array of real numeric values". I don't see HSI mentioned anywhere on that page. If you provide incorrect inputs it is not specified what imshow will display.
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