How to read a TIF file without taking into account the associated TFW file ?

Try to create a copy of the TIF file in a TEMP location and read it from there without the TFW, then compare.Start from a PATH Reader, send to TempPathnameCreator to create TEMP (FME clears it when it's done) then to AttributeManager where you create filecopy_source_dataset with value path_windows and filecopy_dest_filename with value @Value(_pathname)/@Value(path_filename) - needed in FileCopy Writer inserted as FeatureWriter.

Send AttributeManager output to a Tester with clause path_extension=tif.

Passed port goes to a FeatureWriter set as Format File Copy, Dataset path_windows. filecopy_source_dataset and filecopy_source_dataset set in Attribute manager earlier will do the heavy lifting.

Send Summary port output to a FeatureReader set as GeoTiff with Dataset as _dataset attribute and send Generic port to a RasterPropertyExtractor.

Now compare with the values stored in the TFW file with GroupBy set to filename without extension (path_rootname if you use the Failed port of the Tester to read TFW).

You mai need to expose some more attributes at FeatureWriter(File Copy) - Additional Summary Port Attributes (at least path_rootname to GroupBy) and set FeatureReader to Merge Initiator and Result in Attribute and Geometry Handling section.

Here is a sample Workspace to get you started.

Forgot to upload in the initial post and can't add it via Edit.