why append does not working

Question

Rore 2022-9-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1793645-why-append-does-not-working

编辑： Rore 2022-9-3

在 MATLAB Online 中打开

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 

9 个评论
显示 7更早的评论隐藏 7更早的评论

Rore 2022-9-3

@Walter Roberson

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

dpb 2022-9-3

在 MATLAB Online 中打开

@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.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Rore 2022-9-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1793645-why-append-does-not-working#answer_1041200

编辑：Rore 2022-9-3

在 MATLAB Online 中打开

@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