Friday, September 14, 2012

Writing floating point multi-channel TIFFs in Matlab

In a previous post I've commented on how to read a multi-channel floating point TIFF in Matlab using the Tiff class (available since R2009b).
The Tiff class also permits to write all TIFF flavors. But since this TIFF format is so flexible, setting up everything for writing a file is not straightforward. Concretely I'm interested in writing a multi-channel floating point TIFF. Using the details found here, I've wrote this functions that wraps all the parameter setup for writing this type of TIFF files.
function writeTIFF(data, filename)
% writeTIFF(data, filename)
% writes data as a multi-channel TIFF with single prec. float pixels
   t = Tiff(filename, 'w');
   tagstruct.ImageLength = size(data, 1);
   tagstruct.ImageWidth = size(data, 2);
   tagstruct.Compression = Tiff.Compression.None;
   %tagstruct.Compression = Tiff.Compression.LZW;        % compressed
   tagstruct.SampleFormat = Tiff.SampleFormat.IEEEFP;
   tagstruct.Photometric = Tiff.Photometric.MinIsBlack;
   tagstruct.BitsPerSample =  32;                        % float data
   tagstruct.SamplesPerPixel = size(data,3);
   tagstruct.PlanarConfiguration = Tiff.PlanarConfiguration.Chunky;

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