How to convert selected image to gray scale using MATLAB GUI

Hye,

Im using MATLAB GUI to select image it n convert it into gray scale And i get n error

Coding in gui

global cim

[filename pathname] = uigetfile({'*.jpg'},'File Selector');

cim = strcat(pathname,filename);

G=rgb2gray(cim)

axes(handles.axes1)

imshow(G)

Error

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 GUI2>SI_Callback (line 84)

G=rgb2gray(cim)

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in GUI2 (line 42)

gui_mainfcn(gui_State, varargin{:});

Error in

matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)GUI2('SI_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback.

Answer 1

[Mohammad Sami]

Before you can process the image, you need to load it using imread.

Also it's a bad idea to directly concatenate file paths. For cross platform compatability use fullfile function instead.

cim = fullfile(pathname,filename);
cim = imread(cim);
G=rgb2gray(cim)
axes(handles.axes1)
imshow(G)