How can I covert serious of grey scale images to jet images

I would like to know the coding for coversion of serious of grey scale images to jet color

Answer 1

[Walter Roberson]

in_ext = '.png';
out_ext = '.png';
projectdir = 'path/to/files';   %can be '.'
outdir = 'path/to/store/output';  %must be different if in_ext and out_ext are the same

if ~exist(outdir, 'dir')
    mkdir(outdir);
end

cmap = jet(256);

dinfo = dir(fullfile(projectdir, ['*' in_ext]));
filenames = fullfile({dinfo.folder}, {dinfo.name});
nfiles = length(filenames);
for K = 1 : nfiles
   thisfile = filenames{K};
   [~, basename, ~] = fileparts(thisfile);
   outfile = fullfile(outdir, [basename out_ext]);
   if strcmp(thisfile, outfile)
      error('Output directory or extension must be different, refuse to overwrite file "%s', thisfile);
   end
   img = imread(thisfile);
   if ndims(img) > 2
      warning('skipping file that is already color: %s', thisfile);
      continue;
   end
   imwrite(img, cmap, outfile);
end

fprintf('Done\n');