How to convert image to array and save it in a text file?

I want to save an image's array to a text file in order to show it again.

But I don't know how to store it in right conditions.

I'm using the following code:

I = imread('image.jpg');
image=mat2gray(I);
imshow(image);
FID = fopen('FileName.txt', 'w');
if FID == -1, error('Cannot create file.'); end
fprintf(FID, '%f \n', image);
fclose(FID);

Answer 1

[madhan ravi]

dlmwrite('FileName.txt',image)

Answer 2

[Image Analyst]

Do not use image as the name of your variable because it's the name of a built in function.

See attached demo that will take a color image and write a text file in the form

r, g, b, x, y

One row for every pixel.