how to split the png image of size (477x692 ) into [r,g,b] vectors?

I am new to matlab. I have loaded an jpg image and have split the image into [r,g,b] row vectors. The jpg color image has the size as 380x509x3.

jpeg==> img 380x509x3 580260 uint8

function [r, g, b] = split_img(img)
r = img(:,:,1);
g = img(:,:,2);
b = img(:,:,3);
end 

The split worked well.

But when I followed the same process with a png image it was throwing an error. Then when I checked the size of a png color image it is as below

png==> img 477x692 330084 uint8

I understood the the png image size is not 3D. But is it not possible to split a png image into [r,g,b] vectors?

The error which I got was

Error in split_img (line 3)

g = img(:,:,2);

Error in main (line 39)

[r, g, b] = split_img(img);

how to resolve the error???

I am attaching the png image also, which is throwing the error.

Thank you in advance.

[Stephen23]

Did you look at the image type? It is not an RGB image, it is clearly saved as an indexed image:

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

Therefore if you want to get RGB values, you will need to convert the indexed image into an RGB image first:

https://www.mathworks.com/help/matlab/ref/ind2rgb.html

[sri venkatalakshmi sasirekha murakonda]

Thank you Stephen Cobeldick.

Got it.