Average of R,G,B channels

I'm trying obtain the intensity image by finding the average of the R,G,B channels which are extracted from the original image is there any built in method that can do this

Answer 1

[Adam]

mean( rgbImage, 3 );

should work if your image is in n*m*3 RGB format.

[Tarunkishwor Yumnam]

https://in.mathworks.com/matlabcentral/answers/476789-how-to-find-avergae-of-thresholded-elements-only-from-a-matrix

Can you have a look at this? Thanks