How to convert a HSV image into gray image????

i have a rgb image that i have converted into HSv image and applied some filter on that, now i have to convert that filtered HSV image into gray image.

Answer 1

[KSSV]

Convert hsv image to rgb: http://in.mathworks.com/help/images/convert-from-hsv-to-rgb-color-space.html

then convert rgb to gray: http://in.mathworks.com/help/matlab/ref/rgb2gray.html

[user06]

RGB=reshape(ones(64,1)*reshape(jet(64),1,192),[64,64,3]); by this we only get the bands of R G B i want to recover the image as it is.

[Image Analyst]

Well who said to do that?

Answer 2

[Image Analyst]

Use rgb2gray:

hsvImage = rgb2hsv(rgbImage);
% Now do some computations on the HSV image.
% Now convert back to RGB
rgbImage2 = hsv2rgb(hsvImage);
% Convert to gray scale
grayImage = rgb2gray(rgbImage2);

Answer 3

[kautsar rusydi]

a=imread(img);

b=rgb2hsv(a);

c=a(:,:,3);

[Image Analyst]

That totally ignores the hsv image, and just sets c equal to the blue channel of the original RGB image.