Problems writing a tiff file

2013 3 7
2 个回答
3 次查看（30 天）

0 个投票

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

1 个评论
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Jan
Jan 2013-3-7
Please explain with more details, which values are changed.

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回答（2 个）

Jan
Jan 2013-3-7
编辑：Jan 2013-3-7

1 个投票

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.

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Sebastian G
Sebastian G 2013-3-7
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
Sebastian G 2013-3-7
My problem is that it does not record the same matrix. Sorry

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Image Analyst
Image Analyst 2013-3-7

0 个投票

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.

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Sebastian G
Sebastian G 2013-3-7
My problem is that it does not record the same matrix.
The matrix have values 10:10:250
Image Analyst
Image Analyst 2013-3-7
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
Sebastian G 2013-3-7
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
Image Analyst 2013-3-7
Can you also show the code you are using to read it back in and verify what was written out?
Sebastian G
Sebastian G 2013-3-8
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

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