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It just works as expected:

It just works as expected:

$ git clone https://github.com/LibRaw/LibRaw.git LibRaw-github
$ cd LibRaw-github
 
# edited simple_dcraw to get format printed:
$ git diff
diff --git a/samples/simple_dcraw.cpp b/samples/simple_dcraw.cpp
index 47c329a..78f14f0 100644
--- a/samples/simple_dcraw.cpp
+++ b/samples/simple_dcraw.cpp
@@ -145,7 +145,7 @@ int main(int ac, char *av[])
                  T.tformat == LIBRAW_THUMBNAIL_JPEG ? "thumb.jpg" : "thumb.ppm");
 
         if (verbose)
-          printf("Writing thumbnail file %s\n", thumbfn);
+          printf("Writing thumbnail file %s format: %d\n", thumbfn, T.tformat);
         if (LIBRAW_SUCCESS != (ret = RawProcessor.dcraw_thumb_writer(thumbfn)))
         {
           fprintf(stderr, "Cannot write %s: %s\n", thumbfn, libraw_strerror(ret));
 
# no autotools here, so just:
$ make -f Makefile.dist
 
# identify files:
$ ./bin/raw-identify ~/smpl/*
/Users/lexa/smpl/UNCOMPRESSED_14bit.ARW is a Sony ILCE-7M3 image.
/Users/lexa/smpl/_DSC0010.ARW is a Sony ILCE-7M3 image.
/Users/lexa/smpl/fuji_xh1_compressed.RAF is a Fujifilm X-H1 image.
/Users/lexa/smpl/fuji_xh1_uncompressed.RAF is a Fujifilm X-H1 image.
 
# run simple_dcraw -e -v:
$ ./bin/simple_dcraw -v -e ~/smpl/*
Processing file /Users/lexa/smpl/UNCOMPRESSED_14bit.ARW
Writing thumbnail file /Users/lexa/smpl/UNCOMPRESSED_14bit.ARW.thumb.jpg format: 1
Processing file /Users/lexa/smpl/_DSC0010.ARW
Writing thumbnail file /Users/lexa/smpl/_DSC0010.ARW.thumb.jpg format: 1
Processing file /Users/lexa/smpl/fuji_xh1_compressed.RAF
Writing thumbnail file /Users/lexa/smpl/fuji_xh1_compressed.RAF.thumb.jpg format: 1
Processing file /Users/lexa/smpl/fuji_xh1_uncompressed.RAF
Writing thumbnail file /Users/lexa/smpl/fuji_xh1_uncompressed.RAF.thumb.jpg format: 1

-- Alex Tutubalin