Here is the Metadata from Global Mapper for the
*.TIF files in "
Geotiff_for_GIMP.zip" linked by MaikS above:
FILENAME=
gradteigtr_j15_1901_georectified.tif
DESCRIPTION=gradteigtr_j15_1901_georectified.tif
UPPER LEFT X=410828.802
UPPER LEFT Y=7402100.475
LOWER RIGHT X=470804.323
LOWER RIGHT Y=7351571.742
WEST LONGITUDE=12° 58' 38.9455" E
NORTH LATITUDE=66° 44' 09.4323" N
EAST LONGITUDE=14° 20' 58.2552" E
SOUTH LATITUDE=66° 16' 16.8818" N
UL CORNER LONGITUDE=12° 58' 38.9455" E
UL CORNER LATITUDE=66° 43' 27.7428" N
UR CORNER LONGITUDE=14° 20' 15.2835" E
UR CORNER LATITUDE=66° 44' 09.4323" N
LR CORNER LONGITUDE=14° 20' 58.2552" E
LR CORNER LATITUDE=66° 16' 57.6824" N
LL CORNER LONGITUDE=13° 00' 50.0527" E
LL CORNER LATITUDE=66° 16' 16.8818" N
PROJ_DESC=UTM Zone 33 / ETRS89 / meters
PROJ_DATUM=ETRS89
PROJ_UNITS=meters
EPSG_CODE=EPSG:3045
COVERED AREA=3030.5 sq km
LOAD TIME=0.03 s
NUM COLUMNS=6990
NUM ROWS=5889
NUM BANDS=2
PIXEL WIDTH=8.58 meters
PIXEL HEIGHT=8.58 meters
BIT DEPTH=16
SAMPLE TYPE=Unsigned 8-bit Integer
DPI=72
DOCUMENT_NAME=F:\Geotiff_for_GIMP\gradteigtr_j15_1901_georectified.tif
PHOTOMETRIC=Greyscale (Min is Black)
BIT_DEPTH=16
SAMPLE_FORMAT=Unknown Format (0)
ROWS_PER_STRIP=64
COMPRESSION=LZW
ORIENTATION=row 0 top, col 0 lhs
DPI=72
PIXEL_SCALE=( 8.58019, 8.58019, 0 )
TIEPOINTS=( 0.00, 0.00, 0.00 ) --> ( 410833.092, 7402096.185, 0.000 )
MODEL_TYPE=Undefined Model (
Not a GeoTIFF File)
RASTER_TYPE=
Pixel is Point
FILENAME=
gradteigtr_j15_1901_georectified_gf.tif
DESCRIPTION=gradteigtr_j15_1901_georectified_gf.tif
UPPER LEFT X=410828.802
UPPER LEFT Y=7402100.480
LOWER RIGHT X=470804.323
LOWER RIGHT Y=7351571.747
WEST LONGITUDE=12° 58' 38.9455" E
NORTH LATITUDE=66° 44' 09.4324" N
EAST LONGITUDE=14° 20' 58.2552" E
SOUTH LATITUDE=66° 16' 16.8820" N
UL CORNER LONGITUDE=12° 58' 38.9455" E
UL CORNER LATITUDE=66° 43' 27.7429" N
UR CORNER LONGITUDE=14° 20' 15.2835" E
UR CORNER LATITUDE=66° 44' 09.4324" N
LR CORNER LONGITUDE=14° 20' 58.2552" E
LR CORNER LATITUDE=66° 16' 57.6826" N
LL CORNER LONGITUDE=13° 00' 50.0527" E
LL CORNER LATITUDE=66° 16' 16.8820" N
PROJ_DESC=UTM Zone 33 / ETRS89 / meters
PROJ_DATUM=ETRS89
PROJ_UNITS=meters
EPSG_CODE=EPSG:3045
COVERED AREA=3030.5 sq km
NUM COLUMNS=6990
NUM ROWS=5889
NUM BANDS=2
PIXEL WIDTH=8.58 meters
PIXEL HEIGHT=8.58 meters
BIT DEPTH=16
SAMPLE TYPE=Unsigned 8-bit Integer
DPI=72
DOCUMENT_NAME=F:\Geotiff_for_GIMP\gradteigtr_j15_1901_georectified.tif
GT_CITATION=PCS Name = ETRS_1989_UTM_Zone_33N
GEOG_CITATION=GCS Name = GCS_ETRS_1989|Datum = ETRS_1989|Ellipsoid = GRS_1980|Primem = Greenwich|
PHOTOMETRIC=Greyscale (Min is Black)
BIT_DEPTH=16
SAMPLE_FORMAT=Unknown Format (0)
ROWS_PER_STRIP=64
COMPRESSION=LZW
ORIENTATION=row 0 top, col 0 lhs
DPI=72
PIXEL_SCALE=( 8.58019, 8.58019, 1 )
TIEPOINTS=( 0.00, 0.00, 0.00 ) --> ( 410828.802, 7402100.480, 0.000 )
MODEL_TYPE=
Projection Coordinate System
RASTER_TYPE=
Pixel is Area
NOTE:
gradteigtr_j15_1901_georectified_gf.tif:
* Corel PhotoPaint crashes when opening
* Corel PaintShop Pro shows 1 empty image layer (Alpha channel ?

)
* (I have not yet tried opening in GIMP or PhotoShop)
I might personally get some free time available for further comment later today; but perhaps others here may also wish to offer their input at this point ?
GaryGB