Convert to .TIFF without compression

I have a 240x200 double matrix with range 0-1. I want to export it as a .TIFF while preserving original values, but when I do, the values are re-scaled to integers [0-255]. It currently looks like this:

imwrite(image, filename, 'tiff', 'Compression', 'none');

How can I preserve the original values?

Answer 1

[Udit06]

Hi Chris,

You can use the following code to save the image in the .tiff format without scaling. The code snippet uses the MATLAB’s Tiff object, you can refer https://www.mathworks.com/help/matlab/ref/tiff.html for more details.

% filename: the name with which you want to save the file 
% image: 240*200 double matrix with range 0-1 

t = Tiff(filename, 'w'); 
tagstruct.ImageLength = size(image, 1); 
tagstruct.ImageWidth = size(image, 2); 
tagstruct.Photometric = Tiff.Photometric.MinIsBlack; 
tagstruct.BitsPerSample = 64;  % 64-bit floating-point 
tagstruct.SamplesPerPixel = 1; 
tagstruct.PlanarConfiguration = Tiff.PlanarConfiguration.Chunky; 
tagstruct.SampleFormat = Tiff.SampleFormat.IEEEFP; 
tagstruct.Compression = Tiff.Compression.None; 
t.setTag(tagstruct); 
t.write(image); 
t.close(); 

I hope this helps.

[Chris Taylor]

Hi,

That's great, thanks so much!

Chris