The error which you are facing is because, as per the TIFF file format specifications, the sum of number of Photometric color channels and the number of extraSamples should be equal to 'SamplesPerPixel'.
In the above example. RGB color space has 3 color channels while the 'SamplesPerPixel' has 5 color channels. This implies that are are two extra channels which need to be defined explicity using the ExtraSamples tag. You can define the extra channels using the following code:
t.setTag('ExtraSamples',[Tiff.ExtraSamples.Unspecified,Tiff.ExtraSamples.Unspecified]);
You can update your code as follows:
% Generate random data for the 5 channels
R = uint8(randi([0, 65535], 100, 100)); % Red channel
G = uint8(randi([0, 65535], 100, 100)); % Green channel
B = uint8(randi([0, 65535], 100, 100)); % Blue channel
IR = uint8(randi([0, 65535], 100, 100)); % Infrared channel
PNIR = uint8(randi([0, 65535], 100, 100)); % Processed Near Infrared channel
% Combine the channels into a 5-channel image
I = cat(3, R, G, B, IR, PNIR);
t = Tiff('example.tiff','w');
t.setTag('Photometric',Tiff.Photometric.RGB);
t.setTag('Compression',Tiff.Compression.None);
t.setTag('BitsPerSample',8);
t.setTag('SamplesPerPixel',5);
t.setTag('SampleFormat',Tiff.SampleFormat.UInt);
t.setTag('ExtraSamples',[Tiff.ExtraSamples.Unspecified,Tiff.ExtraSamples.Unspecified]);
t.setTag('ImageLength',size(I,2));
t.setTag('ImageWidth',size(I,1));
t.setTag('PlanarConfiguration',Tiff.PlanarConfiguration.Separate);
t.write(I);
t.close();
Hoping this would help!
