how do i convert rgb image to grayscale and then back to rgb?

please help me out if there is any method to do this

Answer 1

[Image Analyst]

Try

grayImage = rgb2gray(rgbImage);  % Convert to gray scale.
rgbImage = ind2rgb(grayImage, colorMap);  % Will not be the same original RGB image though.

Answer 2

[TEJASWINI CHINAWALE]

You can try using jet(m) command which returns the colormap with m colors. You can change the value of m depending on how the converted image should look like.However it is not possible to obtain the original coloured image once you convert it to grayscale or any other form.