I wonder how rgb data are inserted in matlab

Sometimes, I show like 256*256*3 unit8 image value. And someone say that last *3 is for color image(R,G,B). but when I seperate that date ( like (:,:,1),(:,:,2),(:,:,3)), I got gray image, not red, green, blue date. How matlab recognize RGB date?

+ Some coding for convert RGB to matlab color vector exist. What is matlab color vector?

[Stephen23]

" but when I seperate that date ( like (:,:,1),(:,:,2),(:,:,3)), I got gray image, not red, green, blue date."

And that is exactly as expected. A 2D array of values displays as gray.

https://www.mathworks.com/help/matlab/creating_plots/image-types.html

Answer 1

[Image Analyst]

Of course. Any given color plane (channel) is just a 2-D array of numbers, just like a gray scale image. If you want, you can assign them a colormap to make them appear in the color channel that they are, but most people don't do that because (1) it makes them harder to see, and (2) it's simply not needed to carry out any further operations.