how can i use image which is save in variable?

in the following code i wanted to use gray image which saved in variable b for further use,but it gives an error "undefined b" on second line... kindly sort this out

CODE:

i=imread('C:\Users\Romesha\Desktop\eye.jpg');
b=rgb2gray(i);
imshow(b);
im = imread(b);
imshow(im);

[Azzi Abdelmalek]

Post the entire error message

[Bruno Pop-Stefanov]

im = imread(b);

is not going to work. imread should be called on a file, not a variable, like you did in

i=imread('C:\Users\Romesha\Desktop\eye.jpg');

[Walter Roberson]

Good catch, Bruno. I got sidetracked by the "undefined b".

But to be more correct, you can use a variable in imread(), but it needs to be a variable that contains a string. For example,

F = 'C:\Users\Romesha\Desktop\eye.jpg';
im = imread(F);

[romasha]

this is the entire error message

• * *Error in @(hObject,eventdata)gui('PB2_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback* * *

and respected sir i know the above answers already and i want to use that image which is store in variable b so how can i give the path of that image "im=imread(i want gray image which save in variable b in this paranthesis)"

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F