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How to convert selected image to gray scale using MATLAB GUI

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Azhan Lazit
Azhan Lazit on 7 Oct 2020
Edited: Mohammad Sami on 7 Oct 2020
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.

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Answers (1)

Mohammad Sami
Mohammad Sami on 7 Oct 2020
Edited: Mohammad Sami on 7 Oct 2020
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)

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