a matrix save in a variable

i want to save this expression to a variable

imshow( expT ,[] )

like this

 e =  expT

but it save a single value . i need whole matrix

[Adam]

If expT is a single value then so will e be, if expT is a matrix then so will e be so what exactly is your question? You haven't told us what expT is.

[Amir Khan]

i am showing a image which is matrix . imshow(expT, [ ] ) it display the image . now i wnt to save all elements of this image .

[Amir Khan]

clear all
clc

rgb=imread('D:\aa\final\Back ground\background.jpg');

subplot(2,2,1);
imshow(rgb),title('Original RGB');

[ row col wid ] = size(rgb); 
  wid=3

% Log transformation
for i=1:size(rgb,1)
    for j=1:size(rgb,2)
       inb = double(rgb(i,j,wid)+1);
        Lb(i,j,wid) = log2(inb);
    end
end

% Exponantial transformation
for i=1:size(rgb,1)
    for j=1:size(rgb,2)
        inb = double(Lb(i,j,wid)+1);
        Eb(i,j,wid) = exp(inb);
    end
end

logTg = (Lb/(max(Lb(:))))*255; 
expTg = (Eb/(max(Eb(:))))*255; 

   subplot(2,2,2);

   imshow(logTg,[]),title('Log Transformed'); 

subplot(2,2,3);
 imshow( expTg ,[]) , title('Exponential of Log Transformed'); 

subplot(2,2,4);
e=expTg;
 imshow( e ) , title(' B Exponential of Log Transformed');

Answer 1

[Walter Roberson]

Is the question to save the elements as colored on the screen ? If so then use the File Exchange Contribution freezeColors and then get() the CData field of the image() object. For example,

h = image(expT, []);
freezeColors();
fullimage = get(h, 'CData');

[Amir Khan]

please change the value of wid

[ row col wid ] = size(rgb); wid=1

the result is

basically i want to get its rotten area

if i put your code

h = image(expT, []);
freezeColors();
fullimage = get(h, 'CData');

Error in RGB_expo_R_G_B_2_R (line 61) h = image(expT, []);