why append does not working

I'm trying to save multiple images in file

but it save one image

img1 = imread("try1.pgm");
img2 = imread( "try2.pgm");

folder = "/Users/roaaalnader/Documents/MATLAB/TryImg.tif" % file.tif path
folder=fullfile(folder,'img.tif') % to solve you don't have permission error
imwrite(img1,folder);
imwrite(img2,folder,'WriteMode','append' ); % here append doesn't work

%% see the attached picture the file has just the frist image 

[Mathieu NOE]

hello

it works ony for multipage TIFF format (as confirmed by the documentation) :

Write Multiple Images to TIFF File

Write multiple images to a single multipage TIFF file.

Create two sets of random image data, im1 and im2.

im1 = rand(50,40,3);

im2 = rand(50,50,3);

Write the first image to a new TIFF file. Then, append the second image to the same file.

imwrite(im1,'myMultipageFile.tif')

imwrite(im2,'myMultipageFile.tif','WriteMode','append')

[Rore]

Thank you I used tif and there is no error now

but it didn't append

now just frist image in file

[dpb]

Don't just say something didn't work, show us the exact code used and the results...

[Rore]

ok i edited the qustion with code

[dpb]

OK, I don't see any overlooked typos like bad capitalization or such that could been a problem...thanks. Always gotta' check all the details before jumping to any conclusions.

So, now, how did you create the image to prove is only one there?

What does

...
imwrite(img1,folder);
!dir '/Users/roaaalnader/Documents/MATLAB/TryImg.tif/img.tif'
imwrite(img2,folder,'WriteMode','append' ); % here append doesn't work
!dir '/Users/roaaalnader/Documents/MATLAB/TryImg.tif/img.tif'

show for the file size?

Seems to work ok here w/ R2020b; what release are you using?

[Walter Roberson]

Are you sure that you want

/Users/roaaalnader/Documents/MATLAB/TryImg.tif/img.tif

as your final image name? With the folder having a .tif extension as well as the file having a .tif extension ?

[Rore]

@dpb I checked the file and there is only one image

I'm using R2022a

[Rore]

@Walter Roberson

I want all the image in the TryImg.tif with .tif extension

[dpb]

@Walter Roberson may be on to something with the file naming -- I didn't test that although I did notice it.

...
folder = "/Users/roaaalnader/Documents/MATLAB/TryImg";       % file .tif path
folder=fullfile(folder,'img.tif');
imwrite(img1,folder);
imwrite(img2,folder,'WriteMode','append' ); % here append doesn't work

Then your final file will be in file

/Users/roaaalnader/Documents/MATLAB/TryImg/img.tif

removing the extra .tif on the folder name.

Again, you didn't actually show us the results -- just telling us something isn't enough to be able to prove what did/did not happen.

Show the results between the imwrite calls asked for before so we can see actual results obtained -- we can't see your terminal from here, sorry.

Answer 1

[Rore]

@Mathieu NOE @dpb @Walter Roberson

Thank you so much for eveyone helped me .

I fixed the problem (append not working) by using sprintf('%d.tif', k); inside loop

to have different name for evey pictre like 1.tif , 2.tif , ...

THE CODE :

for k = 1:10

  % read the images from one file  

  jpgFilename = sprintf('%d.pgm', k);
  fullFileName = fullfile("filename", jpgFilename);
  if exist(fullFileName, 'file')
    imageData = imread(fullFileName );
  else
    warningMessage = sprintf('Warning: image file does not exist:\n%s', fullFileName);
    uiwait(warndlg(warningMessage));
  end



% then ,I did some process in the image 




% after process , save the image 
% find the file path to save the image inside it 
folderCover="/Users/myName/Documents/MATLAB/Cover.tif"
% make name for every image -> 1.tif , 2.tif , 3.tif , ...
jpgFilename = sprintf('%d.tif', k);

 fullFileNameCover = fullfile(folderCover, jpgFilename);




if k ==1  % first time to write 
imwrite(imageData,fullFileNameCover );
else 
imwrite(imageData,fullFileNameCover,'WriteMode','append')
end


end

Answer 2

[Rore]

'WriteMode' is not a recognized parameter is fixed

by using .tif extension to all images and file as