Why does projfwd not work on some geotiff files?

I believe I have discovered the problem. There are multiple types of geoTIFF files, each requiring different treatment. I've written how I handled the differences below. Note that my ultimate goal was to convert latitude and longitude data into pixel coordinates, which I call 'row' and 'col'.

%Get geoTIFF file information
info = geotiffinfo(geoTIFF_filename);

%Get geoTIFF image file data based on ColorType field of 'info'
switch lower(info.ColorType)
     case 'indexed'
          [~, ~, R] = geotiffread(geoTIFF_filename);
     otherwise
          [~, R] = geotiffread(geoTIFF_filename);
     end

   %Convert latitude and longitude to pixel coordinates based on class of R
   switch class(R)
        case 'map.rasterref.GeographicCellsReference'
             [row, col] = latlon2pix(R, lat, lon);
        case 'map.rasterref.MapCellsReference'
             [X, Y] = projfwd(info, lat, lon);
             [row, col] = map2pix(R, X, Y);
        otherwise
             error('Unrecognized format for R');
   end