how to save/write images using for loop?

for i=1:10
   imwrite(x,'i.jpg') % x be a image to write 
end;

how to vary i that different images can be saved?

Answer 1

[Azzi Abdelmalek]

for i=1:10
   imwrite(x,sprintf('%d.jpg',i))
end;

[sumit kumar]

Thank you sir....

[Thara C.S]

sir,

if it in the case of geotiffwrite?

can use the same code?

[ABDULMAJEED ALYAZIDI]

Thanks!

[Soner Kar]

Thanks a lot!

Answer 2

[Mischa Kim]

Azizullah, the code snippet below shows you how to save an (or several) images using a loop.

N = 4;
A = imread('my_img.png');
for ii = 1:N   
   imwrite(A,strcat('my_new',num2str(ii),'.png'));
end

The strcat command creates (oncatenates) a new string for each image containing a number (as a possible image identifier).

[azizullah khan]

thanks bro......................

[Kamran shahani]

bro and how I read and write multiple images I have code when i select two pictures, it give me error :

Error in imread (line 316)
[filename, fmt_s, extraArgs] = parse_inputs(varargin{:});

%improve underwater image 
tic;
[filename, pathname, filterindex] = uigetfile( ...
{
   '*.*',  'All Files (*.*)'}, ...
   'Pick a file', ...
   'MultiSelect', 'on');

if isequal(filename,0)
   disp('User selected Cancel')
else
   disp(['User selected', fullfile(pathname, filename)])
end

Il=imread(filename);

% imshow(Il), title('original');
RGB=Il;
cform2lab=makecform('srgb2lab');
LAB= applycform(RGB, cform2lab);
%image onvert in to L*A*B color  space
L=LAB(:,:,1);
LAB(:,:,1)=adapthisteq(L,'cliplimit', 0.02, 'Distribution', 'rayleigh');
cform2srgb=makecform('lab2srgb');
% convert back to RGB
A=applycform(LAB, cform2srgb);
t=toc,
 imwrite(A,strcat('a','.jpg'))
subplot(2,2,1), imshow(RGB), title('BEFOR CLAHE');
subplot(2,2,2), imshow(A), title('AFETR CLAHE');

[Image Analyst]

That's because you constructed the full filename when you used disp() but forgot to use it when you called imread. Also, multiselect needs to be off, not on since imread() can't open multiple files at once. To fix:

% Have user browse for a file, from a specified "starting folder."
% For convenience in browsing, set a starting folder from which to browse.
startingFolder = 'C:\Program Files\MATLAB';
if ~exist(startingFolder, 'dir')
  % If that folder doesn't exist, just start in the current folder.
  startingFolder = pwd;
end
% Get the name of the file that the user wants to use.
defaultFileName = fullfile(startingFolder, '*.*');
[baseFileName, folder] = uigetfile(defaultFileName, 'Select a file');
if baseFileName == 0
  % User clicked the Cancel button.
  fprintf('You clicked the Cancel button.\n');
  return;
end
fullFileName = fullfile(folder, baseFileName)
fprintf('You chose file %s.\n', fullFileName);
% Read in the file.
Il = imread(fullFileName);

Answer 3

[Image Analyst]

There is a FAQ on the subject: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

[Muhammad Hammad Malik]

i am using this code

 N = 4; A = imread('my_img.png'); for ii = 1:N imwrite(A,strcat('my_new',num2str(ii),'.png'));

but when i run this code it is saving multiple images but when again i run this, it overwrite the images on previous ones instead creating the new images. so how to do that? thanks

[Image Analyst]

Try this:

N = 4;
% A = imread('my_img.png');
A = imread('cameraman.tif');
titleBarCaption = 'Overwrite?';
for ii = 1 : N
  baseFileName = sprintf('my_new%d.png', ii);
  fullFileName = fullfile(pwd, baseFileName);
  if exist(fullFileName, 'file')
    promptMessage = sprintf('%s exists already.\nDo you want to overwrite %s?', baseFileName);
    buttonText = questdlg(promptMessage, titleBarCaption, 'Yes', 'No', 'Yes');
    if strcmpi(buttonText, 'Yes')
      imwrite(A, fullFileName);
      fprintf('Wrote %s\n', fullFileName);
    else
      fprintf('Skipped %s\n', fullFileName);
    end
  else
    imwrite(A, fullFileName);
    fprintf('Wrote %s\n', fullFileName);
  end
%   recycle on;
%   delete(fullFileName);
end

[Muhammad Hammad Malik]

thanks. i tried but getting error.i want to know that what is 'fullFileName' here? and i want to capture images at different time but each time new captured image replaced with old image, i want to keep all images

[Image Analyst]

fullFileName is what you did like this:

strcat('my_new',num2str(ii),'.png')

but with the folder prepended.

[Muhammad Hammad Malik]

i tried your code but still getting error

[Image Analyst]

Uh, okay.... So think about what you might be able to do, if you were in our shoes, to help us to help you.