What is wrong with my image

Hey guys, I have a Matlab code that is supposed to load images and it does. The problem is there is one image that I can’t pull up. I keep getting the error below. How do I fix my image or the code? The error: the error:

>> guide Error using rgb2gray>parse_inputs (line 80) MAP must be a m x 3 array.

Error in rgb2gray (line 52) isRGB = parse_inputs(X);

Error in corrosionTracker>b_01_Callback (line 184) testImg = imresize(rgb2gray(read(imgSet,1)), resizrFact);

Error in gui_mainfcn (line 95) feval(varargin{:});

Error in corrosionTracker (line 56) gui_mainfcn(gui_State, varargin{:});

Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)corrosionTracker('b_01_Callback',hObject,eventdata,guidata(hObject)) Error while evaluating UIControl Callback.

Answer 1

[Walter Roberson]

The image is not in true color rgb format. Either it is grayscale, or indexed (pseudocolor) or CMYK or RGBA.