How to convert five JPG images into PNG using FOR LOOP?

Can someone help me? On converting five jpg images into png images. Please share the complete code with pictures, if you can.

I found the code but it isn't working. Debug this code and tell me where is the problem

f= dir('quetta/*.jpg');
fil = {f.name};
for k =1 :numel(fil)
    file=fil{k}
    new_file=strrep(file,'.jpg','.png')
    im=imread(file)
    imwrite(im,new_file)
end

[Guillaume]

There are many free image viewers that will let you do this and more with the click of a button. This would be a lot faster than waiting for an answer here.

I use IrfanView which has batch conversion, but there's plenty of similar programs.

[edusadiq]

But Guillaume

I'm learning MATLAB thats why I need to understand the backend...

[Guillaume]

Well, in that case, "Debug this code and tell me where is the problem" why haven't you tried to do that yourself?

There is no problem with the code (other than the lack of comments) and it will work as advertised as long as the conditions are right. Unfortunately, since you haven't told us what problem you have with it we can't really help you. "it isn't working" is completely useless if you don't tell us what's happening. In particular, if you get an error give us the full text of the error message.

[Image Analyst]

I agree. I still don't know what's not working? Maybe displaying the image, if that's what you want. I tried to make a guess at it, and that's why I put my answer below in the Answers sections but you haven't said anything about my answer below. At least if my code below also didn't work, say what it's not doing that you want it to do.

Answer 1

[Image Analyst]

Try this, adapted from THE FAQ:

% Specify the folder where the files live.
myFolder = 'C:\Users\yourUserName\Documents\My Pictures';
% Check to make sure that folder actually exists.  Warn user if it doesn't.
if ~isfolder(myFolder)
	errorMessage = sprintf('Error: The following folder does not exist:\n%s\nPlease select another folder.', myFolder);
	uiwait(warndlg(errorMessage));
	myFolder = uigetdir();
end
% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(myFolder, '*.jpg'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
numFiles = length(theFiles);
if numFiles == 0
	warningMessage = sprintf('Warning: no JPG images found in the folder:\n%s', myFolder);
	uiwait(warnuser(warningMessage));
	return;
end
for k = 1 : numFiles
	baseFileName = theFiles(k).name;
	fullFileName = fullfile(myFolder, baseFileName);
	fprintf('Now reading %s (#%d of %d).\n', fullFileName, k, numFiles);
	% Now do whatever you want with this file name,
	% such as reading it in as an image array with imread()
	imageArray = imread(fullFileName);
	imshow(imageArray);  % Display image.
	caption = sprintf('%s (#%d of %d)', fullFileName, k, numFiles);
	title(caption, 'FontSize', 14, 'Interpreter', 'none');
	drawnow; % Force display to update immediately.
	% Write it out as a PNG file.
	baseFileName = strrep(lower(baseFileName), '.jpg', '.png');
	outputFileName = fullfile(myFolder, baseFileName);
	fprintf(1, 'Now writing %s\n', outputFileName);
 	imwrite(imageArray, outputFileName);
end

[Hassan Mehmood Khan]

Thank you so much for the code