working on one channel at a color space

Hi ; I have converted RGB image to YCbCr color space using

myImage=rgb2ycbcr(myImage);

this has three channel Y,Cb and Cr i need to work just at Y channel ,How can I do that? may you help me Thanks in advance

Answer 1

[Walter Roberson]

myImageycbcr = rgb2ycbcr(myImage);
myImagey = myImageycbcr(:,:,1);

[eman]

Thank you