How to modify image in matlab and again store it?

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SAMVIT MAHARAJ
SAMVIT MAHARAJ 2015-2-3
I have got coloured 5 face images. I want to convert them to grayscale and store them in jpg format in the same folder.
I have used rgb2gray to convert it and then when i store it in the folder it gives the dimension of a colour image though the image appears black and white i.e my new image dimension after saving it in jpg become 480*640*3
How do I get rid of this 3 factor? Do i have to use adobe photoshop? or is it possible in matlab?

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