saving images onto a folder

hello, i have images being generated after every loop and i want to store them all in one folder only. but with the saveas option, the images get overrriden to those already in the folder. do you guys know how i can fix this? thank you. i am using the following code right now:

h =  findobj('type','figure');
n = length(h);
for k=1:n
    saveas(figure(k),fullfile('C:\Users\Desktop\project\A data\SegmentedCharWithBlanks',['figure' num2str(k) '.jpg']));
end

[Adam]

That looks like it should create n distinct files. They will overwrite any older files of the same names though, of course. Is that what you mean or are you saying that each of the n figures overwrites the file of the previous one?

[shru s]

I am sorry for not being clear enough. I want to save the new files in such a way that my older files arent erased. suppse i had figure1 , figure2, figure3 in my folder already, i wish to save my new files as figure4, figure5 and so on.

[Adam]

In general it is simple enough to devise an algorithm to reuse freed up numbers in a sequence, but is that what you want to do always - e.g. if you have figure1, figure2, figure4, figure5 already saved and you now want to save 3 new figures. Do you expect these to be named figure3, figure6 and figure7?

That can get quite complicated when you have to keep searching the file list and extracting the numbers off the end of filenames even before you apply such an algorithm.

If it doesn't really matter to you what they are called so long as they are different I would suggest attaching a random number to the end instead. This will almost always be unique, but you should still run it in a loop, creating a random number and checking if the file with that number exists before saving. If it does then take the next random number, etc. The range of such random numbers would depend how many files you expect to have. You can scale your random numbers to any range you like so long as it is big enough that clashes are highly unlikely.

[shru s]

it doesnt matter what they are called, but I need them to be saved in the order in which they have been generated because ill be using them in a later stage. so its really important to me to save them in a sequence. if they are named figure1, figure2, etc they wont get jumbled up. if there was a way to save them as A,B,C also its awesome

[Adam]

Can you not keep hold of the names for later on? Or use the date modified property of the files to know the order?

I assume the existing files in the folder could have been created at any time in the past?

So I guess you could just do a one-time scan of all existing files in the folder, break down the filenames in the same way you put them together and find the largest number amongst those already saved. Then just start your new indexing from there instead of from 1.

[shru s]

The same program is generating a number of images per loop and im trying to save them all together. I did try to use the largest number to index but havent been successful yet. Ill try it again.Thank you so much for taking the time to look into my issue. I am grateful

[shru s]

got it!

Answer 1

[Image Analyst]

Use sprintf() to create the filename. It can be unique for each iteration of your loop. Then use imwrite() if you want to save images. For example:

baseFileName = sprintf('Image #%d.png', k);
fullFileName = fullfile(folder, baseFileName);
imwrite(yourImage, fullFileName);

Use saveas() or save() (instead of imwrite) if you want to save figures - basically screenshots of the axes with tickmarks, labels, title, legends, stuff in the graphical overlay above the image like lines and text, etc.

[shru s]

Thank you so much for always helping me out!

[Fawad Chandio]

fullFileName means which file...??

baseFileName .....??

Answer 2

[Malayappan Shridhar]

I wish to write a binary image imbin to a folder with the name shown below.

WriteFileName = "C:\ISI-Kappa\FromWorkBin\Front_1\b_180311788230057_Front.jpg"

My command is imwrite(imbin, WriteFileName)

I get this error: Error using imwrite>parse_inputs (line 523)

A filename must be supplied.

I appreciate any help to resolve this error

[Image Analyst]

Are you sure that folder already exists because I'm not sure imwrite() will create folders automatically, though it might. You also might try using forward slashes. What does this say:

whos imbin

Is it a uint8 image?