Problems writing a tiff file

When I write an array as tiff, change the values.

if true
  % code
end
I=round(rand(10,10,3)*10);
file='c:\temp';
for i=1:3
   imwrite(I(:,:,i),'file','WriteMode','append');
end  if true
  if true
  % code
end

thank you very much

[Jan]

Please explain with more details, which values are changed.

Answer 1

[Jan]

imwrite(I(:,:,i), 'file', 'WriteMode', 'append');

This writes to the file called 'file' in the current directory. I guess you want:

file='c:\temp\Picture.tiff';
imwrite(I(:,:,i), file, 'WriteMode', 'append');

without quotes around the variable file.

[Sebastian G]

My problem is that it does not record the extamente matrix.

 I=round(rand(10,10,3)*10);
  file='c:\temp\Picture.tiff';
  for i=1:3
     imwrite(I(:,:,i),file,'WriteMode','append');
  end

thanks

[Sebastian G]

My problem is that it does not record the same matrix. Sorry

Answer 2

[Image Analyst]

Try the Tiff class. http://www.mathworks.com/help/matlab/ref/tiffclass.html I believe it has more and better functionality regarding tiff files. I've not used the WriteMode append option in imwrite(). But maybe Tiff is worth a try. I don't know what an "extamente" matrix is, but do you see the file size in bytes increase after each write? If so, that indicates that some data is being appended.

[Sebastian G]

My problem is that it does not record the same matrix.

The matrix have values 10:10:250

[Image Analyst]

Jan has already asked you to provide details. Why are you not letting us help you by providing details? Are you saying that any values in the set 10, 20, 30, ... 240, 250 get changed to 12.3, pi, e, 42, a bazillion, ... cos(-999), a google, rand(1), and 42^(pi*e)?

[Sebastian G]

My problem is that the matrix is not recorded with the numbers generated. as well explained in the question.

    I=round(rand(10,10,3)*10);
    file='c:\temp\Picture.tiff';
    for i=1:3
       imwrite(I(:,:,i),file,'WriteMode','append');
    end

The save numbers are 80, 120, 160, 255 not the same of matrix.

[Image Analyst]

Can you also show the code you are using to read it back in and verify what was written out?

[Sebastian G]

The problem was not divided by 255

I=round(rand(10,10,1)*10);
file='c:\temp\Picture.tiff';
I2=I./255; 
imwrite(I2(:,:),file,'tiff');
I1(:,:)=imread(file,'tiff');
a=isequal(I,I1);

Thanks