How do i change my image

From 3D(JPEG) to 2D

Do i change it to grayscale? how do i do so .

??? Error using ==> iptcheckinput Function IMHIST expected its first input, I or X, to be two-dimensional.

Answer 1

[David Young]

Have a look at rgb2gray. Alternatively, consider applying imhist to the separate colour planes.