How to generate multiple tiff files into my file path?

I am trying to create a series of tiff files and am not sure why the following loops do not work.

thresholdarray = [0.01, 0.1, 0.001];
medfiltarray = [2, 8, 10, 16];

for i = 1:3
    thresholdvalue = thresholdarray(1,i);
for j = 1:4
        medfiltvalue = medfiltarray(1,j);
        s1 = '4.04GFPthreshold:';
        s2 = num2str(thresholdvalue);
        s3 = 'medfilt:';
        s4 = num2str(medfiltvalue);
        s5 = '.tif';
     tiffname = strcat(s1,s2,s3,s4,s5);
     tiff = Tiff(tiffname,'a');
end
end
% why doesn't this code above work, but this code below generates a new tiff file in my file path?
tiff = Tiff('newtiff.tif','a');

Answer 1

[Chunru]

thresholdarray = [0.01, 0.1, 0.001];
medfiltarray = [2, 8, 10, 16];
for i = 1:3
    thresholdvalue = thresholdarray(1,i);
    for j = 1:4
            medfiltvalue = medfiltarray(1,j);
            s1 = '4.04GFPthreshold_';   % <===  : -> _
            s2 = num2str(thresholdvalue);
            s3 = 'medfilt_';            % <===
            s4 = num2str(medfiltvalue);
            s5 = '.tif';
         tiffname = strcat(s1,s2,s3,s4,s5);
         tiff = Tiff(tiffname,'a');
    end
end
dir

.                                     4.04GFPthreshold_0.001medfilt_2.tif   4.04GFPthreshold_0.01medfilt_2.tif    4.04GFPthreshold_0.1medfilt_2.tif     
..                                    4.04GFPthreshold_0.001medfilt_8.tif   4.04GFPthreshold_0.01medfilt_8.tif    4.04GFPthreshold_0.1medfilt_8.tif     
4.04GFPthreshold_0.001medfilt_10.tif  4.04GFPthreshold_0.01medfilt_10.tif   4.04GFPthreshold_0.1medfilt_10.tif    
4.04GFPthreshold_0.001medfilt_16.tif  4.04GFPthreshold_0.01medfilt_16.tif   4.04GFPthreshold_0.1medfilt_16.tif    

Answer 2

[Image Analyst]

You cannot use colons in the file name (for Windows) unless it's immediately after a drive letter. Try this:

thresholdarray = [0.01, 0.1, 0.001];
medfiltarray = [2, 8, 10, 16];
% Read in a gray scale input image.
grayImage = imread('cameraman.tif');
subplot(1, 3, 1);
imshow(grayImage);
title('Original Image');
for thresholdIndex = 1 : 3
    thresholdvalue = thresholdarray(1, thresholdIndex);
    for filterIndex = 1 : 4
        medFilterValue = medfiltarray(1, filterIndex);
        
        % Create an output image.
        % Do median filter on the gray scale image.
        outputImage = im2double(medfilt2(grayImage));
        subplot(1, 3, 2);
        imshow(outputImage);
        caption = sprintf('Median Filter of %d', medFilterValue);
        title(caption)
        % Now threshold it.
        t = thresholdvalue * max(grayImage, [], 'all'); % Convert to gray levels.
        outputImage = outputImage > t;
        
        subplot(1, 3, 3);
        imshow(outputImage);
        caption = sprintf('Threshold Value of %.1f', t);
        title(caption)
        drawnow; % Force display to refresh immediately.
        
        outputFileName = sprintf('4.04GFPthreshold %.3f_medfilt %d.tif', ...
            thresholdvalue, medFilterValue);
        outputFileName = fullfile(pwd, outputFileName); % Prepend folder.
        fprintf('Now writing output file: "%s".\n', outputFileName);
        
        % Write output file to disk
        imwrite(outputImage, outputFileName);
    end
end